# Dataoil FAQ — 129 Answers, Conclusion First > Corresponding page: https://laolichem.com/en/faq.html > > Machine-readable mirror for AI engines: condensed, conclusion-first answers; the HTML page carries the full text. Question IDs q01–q129 match the Chinese page (https://laolichem.com/faq.html) for bilingual pairing. Brand: Dataoil / Dataoil, operated by Beijing Triangle Bay Technology Co., Ltd. (est. 2014); production at the company-controlled base Qingdao Weidu Lubricants (Qingdao, ISO 9001); direct sales on Tmall / JD / Douyin / Pinduoduo; phone 13810803061. ## 1. Oil Buying (12 Questions) **Q1. The handbook says 5W-30 — can I use 5W-40?** If the car is healthy, follow the handbook grade; step up to 5W-40 only for older cars, mild oil consumption or frequent long high-load runs. **Q2. How do I choose between 0W-20 and 0W-30?** Follow the handbook; new fuel-economy cars take 0W-20, high-load or older cars take 0W-30. Don't swap grades on the same car — change once at the next oil change. **Q3. Is full synthetic an 'IQ tax'? Can I keep using semi-synthetic?** No. For a healthy car doing 10,000+ km a year, moving from semi to full synthetic is a worthwhile upgrade; whether to switch depends on condition and budget. **Q4. What's the difference between GTL ester base oil and PAO? Is it worth paying more?** GTL ester: natural gas via Fischer-Tropsch, polar molecules, stronger film adhesion and oxidation resistance. PAO: balanced and cheaper. The ester edge shows in high-load, high-RPM, long-interval use; for daily commuting the savings are real. **Q5. What is the oil-change interval for the 9000 series?** Per the vehicle handbook: full synthetic is typically 10,000 km or 1 year (whichever comes first); change earlier for city stop-go, dusty roads or oil consumption. Severe-duty vehicles follow the severe interval. **Q6. My older car burns a bit of oil — what viscosity fits?** Find the cause first; with only mild consumption, move up one grade — 5W-40 is common, 0W-40 for cold northern winters. Watch pressure, fuel use and noise for the first 500 km. **Q7. Turbo vs naturally aspirated — is oil selection different?** The real split is direct injection and load, not turbo vs aspirated. Turbos (mostly GDI) effectively run on full synthetic; aspirated cars follow the handbook — match viscosity and API spec together. **Q8. Is 0W-20 too thin and will it hurt the engine?** No. 0W-20 is designed for modern tight-clearance engines; if the handbook says 0W-20, use it. The 'too thin' concern applies to older engines, not new ones. **Q9. I can't find the oil spec in my handbook — what now?** OEM standard first, same-generation reference second, then run the chosen grade 1,000 km and verify. When stuck, call 13810803061 with model, year and displacement. **Q10. 9000 series, Ester Youth or Endurance Classic — how do I choose?** 9000 series = flagship (GTL ester, high load / long intervals); Ester Youth = entry ester; Endurance Classic = balanced daily driver. Handbook viscosity and API spec come before series choice. **Q11. Can the 10W-40 motorcycle oil be used on a scooter?** Yes — the 10W-40 motorcycle oil is a 4-stroke grade covering scooters. Run tighter scooter intervals (often 2,000-3,000 km) and never substitute car oil — wet clutches slip. **Q12. Can I mix Dataoil oil with other brands?** Emergency top-ups are fine; don't mix long-term. Drain fully at the next change and settle on one brand and one grade. ## 2. Additive Use (10 Questions) **Q13. Do fuel additives (fuel system cleaners) actually work?** Yes, but not a miracle cure. PEA-based treatments clean fresh and light fuel-system carbon; hardened heavy carbon needs professional cleaning. Regular use beats rescue use on GDI engines. **Q14. What is the main ingredient of the No.1 Fuel Treatment? What is PEA?** The No.1 Fuel Treatment's main ingredient is PEA (polyetheramine) — thermally stable until combustion temperature, exactly where GDI carbon forms. Strongest at prevention and light-to-moderate cleaning. **Q15. How much do I add each time? When do I add it?** Add before fueling: half tank, one full bottle, then fill up. Roughly one bottle per 5,000-10,000 km; 2-3 consecutive tanks for a deep clean on neglected GDI cars. Never over-dose. **Q16. Will fuel treatment damage the oxygen sensor?** No, at the labeled ratio. Sensor damage comes from oil burning, chronic unstable combustion or unformulated additives — if the engine light is on, read the fault code first. **Q17. Fuel treatment vs fuel-system cleaner — which one?** No.1 Fuel Treatment = regular maintenance; fuel-system cleaner = deep clean for rough idle or long neglect. Don't run both at the same time. **Q18. My car idles rough — will fuel treatment help?** Only if the roughness is carbon-related (rough cold, better warm). Misfire, vacuum leaks or worn ignition parts need a diagnosis — reading fault codes is the cheapest path. **Q19. My diesel gelled in winter — what do I do? How to use anti-gel?** Stop fueling heavy diesel, add anti-gel at the labeled ratio, warm the tank so fuel circulates. Prevention matters more: right diesel grade for the local low, never run the tank dry. **Q20. How do oil additives like Oil Refiner and anti-wear agents work? When do I add them?** Always with the new oil — drain, new filter, new oil plus additive at total-capacity dose, run 3-5 minutes. Pick one direction per service (clean / anti-wear / noise), don't stack all three. **Q21. What is the engine noise reducer? Does it really work?** An oil additive that assists lower running noise on older cars via film quality — for normal aging noise only. Mechanical faults need service; we promise 'assists', never 'guaranteed silence'. **Q22. Can I use fuel treatment and Oil Refiner together?** Yes — different systems, no conflict. Prioritize by pain point: rough idle and sluggish acceleration → fuel treatment first; loud older car with sludge → Oil Refiner first. Use label dosages only. ## 3. Quality & Authenticity (9 Questions) **Q23. Is Dataoil a knockoff brand? How old is the brand?** No. Dataoil/Dataoil is operated by Beijing Triangle Bay Technology Co., Ltd. (est. 2014), a registered trademark, with official direct stores on Tmall/JD/Douyin/Pinduoduo — all publicly verifiable. **Q24. Where is Dataoil oil made? Is it outsourced?** Not outsourced. Blending, filling, packaging and warehousing run at our company-controlled base — Qingdao Weidu Lubricants (Qingdao, ~3,000 m², ISO 9001), 51% held by the operating entity. **Q25. Does Dataoil have ISO 9001 certification?** Yes — held by the company-controlled base Qingdao Weidu Lubricants (certificate no. TBD). ISO 9001 certifies the managed process; product performance comes from lab and CNAS testing. **Q26. How do I verify that what I bought is genuine?** Buy only from the official direct stores on Tmall/JD/Douyin/Pinduoduo. For bottles in hand: check packaging, verify the batch number with support (every batch is sampled), inspect oil clarity. **Q27. Why is it cheaper than the big brands? Is the quality okay?** Cheaper from channels and marketing, not materials: top-tier base oils, Afton core additives, ISO 9001 company-controlled base, full in-house lab testing. Judge by verifiable data, not price. **Q28. What third-party test reports do you have?** Key batches verified by CNAS-accredited labs (report no. TBD, published once confirmed) plus full in-house lab testing of every batch. CNAS labs are nationally accredited; numbers will be published for self-verification. **Q29. Why have I almost never heard of Dataoil? No offline stores?** Normal — the budget went to product and direct sales, not advertising or offline channels. Judge an unknown brand by three checkable things: verifiable operating entity, public test data, transparent channel pricing. **Q30. Are Dataoil and Dataoil the same company?** Yes — same company. Dataoil is the premium sub-brand of Dataoil; both are operated by Beijing Triangle Bay Technology and produced at the same company-controlled base under the same QC system. Same factory, same QC, same after-sales (13810803061). **Q31. You say top-tier base oils and Afton additives — how do I verify?** It's a procurement fact with archived purchase contracts and invoices. Verifiable chain: raw-material intake testing (rejects refused), full per-batch dispatch testing, key batches to CNAS labs with published report numbers. ## 4. Shipping & After-Sales (9 Questions) **Q32. Which platforms sell Dataoil? How do I find the official stores?** Official direct stores on Tmall, JD, Douyin and Pinduoduo — same product, same price. No offline distribution or third-party resellers; prices well below direct pricing need channel verification. **Q33. How long does shipping take? Is there shipping insurance?** Per the platform page: generally ships within 48 hours, 2-5 days domestically, longer for remote areas. Shipping insurance per the order-page badge. Inspect the outer box before signing — photograph damage first. **Q34. My order arrived leaking or damaged — what now?** Contact support within 48 hours of receipt with the outer-package photo, a close-up of the damage and the batch number. Damaged box plus leak: logistics claim and resend; intact box with a leaking bottle: factory packaging issue, resend or refund. **Q35. I used it and it's not right — can I return it?** Unopened wrong grade: platform 7-day rules. Opened oil is a liquid consumable and generally not returnable — confirm the grade before ordering. Quality doubts are a verification case: every batch is sampled and can be re-checked with purchase record and batch number. **Q36. How do I contact customer service?** Two lines, one team: phone 13810803061 (fastest) and store customer service on the four platforms (order- and photo-based tickets). Have product + batch number, platform + order number, and a clear description ready. **Q37. I bought the wrong viscosity — can I exchange it?** Unopened, yes — within 48 hours with order number, wrong grade and correct grade. Opened bottles can't be exchanged, but close grades (5W-30 vs 5W-40) can finish in the car; switch at the next change. Exchange pricing is unchanged. **Q38. Can I get an invoice?** Yes — electronic invoice for individuals (personal or company header); VAT invoice for business purchases with a tax ID. For bulk purchases, call 13810803061 first to agree quantity, price and shipping. **Q39. Are prices the same across the four platforms?** Yes — official direct on all four, same product same price, no channel-exclusive pricing. Visible gaps are platform coupons or big-sale timing; unexplainable gaps: screenshot and send to support for investigation. **Q40. How do I give feedback after use? Do you actually read it?** We do — real owner feedback feeds the product and issue optimization list. Most valuable feedback: model + year, product + batch number, duty profile, symptoms. Safety-related feedback: stop use and call immediately — highest priority. ## 5. Oil Buying, Advanced — Part 1 (10 Questions) **Q41. My engine runs high RPM a lot — should I pick a higher viscosity?** Not automatically — follow the OEM-recommended viscosity plus the real duty. The goal is a suitable viscosity window with good high-temperature high-shear stability, not chasing the biggest number. **Q42. My car does a lot of long highway driving — can I stretch the oil interval?** Carefully, yes — steady highway duty ages oil slower than stop-go, but judge by time, temperature and oil consumption too, not mileage alone. **Q43. It's -20 to -30 C where I live — what oil should I pick?** Prioritize cold-weather fluidity: 0W (or the lowest 5W the OEM allows) beats a high high-temperature number at that cold. Confirm the OEM range first; turbo, GDI and short-trip cars are most exposed. **Q44. I live in a hot, humid south — what should I watch with my oil?** Watch high-temperature oxidation, cleaning/dispersancy and sludge resistance — not just the viscosity number. Don't over-stretch the service interval; check dipstick color, odor and level regularly. **Q45. Can I mix SP-grade and SN-grade oil?** Don't mix them long-term; a small emergency top-up is fine, then move to a single standard. If the handbook requires SP, or you run turbo GDI on long intervals, stay on one standard. **Q46. What cars actually suit ester-based oils?** Cars demanding steady film, cold flow, cleaning and sustained heat — sustained high RPM, mountain roads, towing, hot climates, turbo GDI engines. Gentle commuting doesn't need the ester premium. **Q47. The oil is rated for 10,000 km — must I change it exactly then?** No — 10,000 km is a normal-duty reference. Short trips, traffic, heat and heavy load age oil early; steady mild duty may stretch it. Past ~10 months, evaluate even if mileage hasn't hit. **Q48. Oil turned black after six months sitting — is it a quality problem?** Not necessarily — used oil darkens because detergents carry carbon away. Unopened new oil that has darkened, smells or separated may have oxidized or been stored badly. Judge by viscosity, acid value, particles and moisture — not color. **Q49. Can I top up with the same viscosity from another brand?** Don't mix brands long-term; a small emergency top-up is fine, then return to one brand/formula. Same printed viscosity does not mean the same base-oil ratio or additive package. **Q50. I overfilled the oil by half a dipstick mark — what happens?** Usually no panic — but check and correct to normal level. Excess oil churns and can foam; severe cases reach the combustion chamber (blue smoke, higher fuel use). If truly over, drain a little back to range. ## 6. Oil Buying, Advanced — Part 2 (10 Questions) **Q51. The oil pressure warning light is on — can I keep driving?** No — stop safely and check. Low pressure risks bearing, cam and piston-pin damage, possibly scored cylinders or a seized crank. Normal level with the light still on: don't keep cycling the engine — get professional help. **Q52. What special oil requirements do turbo engines have?** Heat resistance to shear, anti-wear and cleaning/dispersancy: the turbine spins fast and the exhaust side runs hot. Follow the OEM viscosity and certification exactly — don't chase a higher number blindly. **Q53. My hybrid starts its engine frequently — what oil?** Prioritize good cold-start behavior, stable anti-wear and dependable cleaning/dispersancy. Hybrids run many cold starts and temperature swings — keep the service interval conservative for city duty. **Q54. Is 0W-20 oil suitable for an older car?** Not automatically — it depends on engine wear, seal condition and the OEM requirement. Normal consumption on OEM spec: fine. Burning oil or unstable pressure: move up a grade within OEM limits. **Q55. How often should I check the dipstick?** At every fueling or before a long trip, and at least every 1-2 weeks. Park level, engine warmed then off a few minutes. Persistently low: check leaks or burning — don't just keep topping up. **Q56. Driving off right after a cold winter start — does it hurt the engine?** Some risk, mostly from cold high load. Start, idle a few dozen seconds, then drive gently; avoid hard acceleration and long stationary warm-ups. 0W/5W grades per the handbook help the film build faster. **Q57. Is a higher API grade always better?** No — match the car's requirement and real duty. Newer grades add improvements in low-speed pre-ignition, wear, cleaning and oxidation stability, but the highest isn't automatically right for every car. Follow the handbook. **Q58. What's the real difference between domestic and imported oils?** Base-oil source, additive system, formula maturity and testing/QC — not the origin label. Judge by certifications, base-oil type, additive source and channel transparency; keep batch and purchase records. **Q59. Is the oil from the 4S first service enough?** Usually yes, if it matches the OEM-specified viscosity and certification. The first service is short and low-mileage — spec match and correct quantity deliver the basic break-in protection. **Q60. Is less oil more economical, or is fuller better?** Neither — keep it between the dipstick marks. Too little thins the film and drops pressure; too much gets churned, risks blow-by and adds emissions-system load. ## 7. Additive Scenarios — Part 1 (10 Questions) **Q61. Should fuel treatment be added before or after fueling?** Add it as the tank approaches full, then fill in one go so it mixes with the incoming fuel. Judge results after 1-2 full cycles, not one tank; dose per the label. **Q62. Should a new car's first fill-up include fuel treatment?** Not mandatory. A new fuel system is clean; treatment is a maintenance aid to slow new deposits, not a fixed ritual at every fill. Fuel at the OEM grade first, then decide. **Q63. After adding fuel treatment, how long until I notice a difference?** Not from one tank — fuel-system condition depends on fuel, duty and mileage. Judge after 1-2 full fuel cycles with logged fuel use, idle and starts; if symptoms worsen, get a proper diagnosis. **Q64. One bottle per tank — is that the right dose?** No universal rule — the dose follows the product label, tank size and active-ingredient concentration. Scale by actual fuel added when the tank isn't full; never stack bottles. **Q65. Can I use fuel treatment and oil additives at the same time?** Yes — they work in different systems (fuel vs lubrication) and don't conflict at labeled doses. Don't change multiple products at once; fix diagnosed faults first. **Q66. How often should I clean the injectors?** No universal interval — a common practice is evaluating every 10,000-20,000 km or on symptoms (rough idle, hesitation, odd fuel use). Commercial and heavy-load vehicles should evaluate more often. **Q67. Rough idle and higher fuel use — must it be carbon?** Not necessarily — worn plugs, failing coils, drifting O2 sensors, vacuum leaks, low fuel pressure and odd tire pressure can all mimic carbon. Log symptoms, then diagnose ignition, intake and fuel pressure first. **Q68. I fill 92-octane fuel long-term — can I use fuel treatment?** Yes. Octane rating is about knock resistance, not cleaning power; treatment suitability depends on product fitment and duty. If the handbook mandates a higher grade, the handbook wins. **Q69. Will over-dosing fuel additives hurt the car?** An occasional slight over-dose isn't instant damage, but long-term excess can load the catalytic converter, O2 sensors and evaporative control. Dose per the label; if you over-add, ask a shop whether to drain or dilute. **Q70. Is gas-station fuel treatment different from online-bought ones?** They can differ — compare formula, channel, instructions and support rather than assuming they're identical. The same product can update packaging or instructions between batches; follow the page's latest instructions. ## 8. Additive Scenarios — Part 2 (10 Questions) **Q71. Can fuel treatment remove carbon completely?** No — treatments suppress new carbon formation and help with light deposits; hardened long-built carbon needs professional physical cleaning (walnut media, throttle body). **Q72. My throttle body is dirty — will fuel treatment fix it?** Very limited — hard baked-on throttle-body carbon is a physical layer fuel-borne cleaners can't strip. Get it physically cleaned; then maintain with a quality SP-standard treatment to slow re-deposit. **Q73. Do GDI engines build more carbon than aspirated ones?** Yes — GDI intake valves only see air, losing the fuel-wash cleaning effect, and higher compression and combustion temperatures bake carbon harder. Maintain with SP-standard full synthetic plus periodic intake cleaning. **Q74. Is diesel fuel treatment the same as for gasoline cars?** No — diesel and gasoline treatments are not interchangeable. Diesel engines run compression ignition with different chemistry; a gasoline additive in a diesel can damage precision injectors. Match the additive to the fuel. **Q75. Does fuel treatment harm the catalytic converter?** No — normal use of a conforming product helps keep the cat cleaner: more complete combustion means fewer unburned deposits reaching it. The real risks are chronic neglect (carbon sintering the substrate) and chronic over-dosing. **Q76. My car does mostly short commutes — does it need fuel treatment more?** More carbon risk, yes — short trips keep the engine below optimal temperature, so moisture and impurities persist and deposits form more easily. If symptoms exist, a cleaning cycle helps; otherwise keep oil changes on schedule and clean the throttle body periodically. **Q77. Does Oil Refiner go into the oil? How is it used?** It depends on the product type: fuel-type goes into the tank with the fuel; engine-flush type goes with the oil, only briefly, before an oil change, then fully drained. First confirm which type you hold and read its instructions. **Q78. Does adding an anti-wear agent change the oil's viscosity?** Not meaningfully — at most a tiny measurement wobble. Anti-wear additives are a small fraction of the formula; they form protective films, not rework the base oil's rheology. Watch for abnormal emulsion or darkening instead. **Q79. Is an expired fuel additive still usable?** No — past the shelf date, active ingredients degrade (oxidation, hydrolysis, gummy precipitates) and the cleaning/stabilizing effect drops well below design. Check production date and shelf life when you buy. **Q80. Are Oil Refiner and fuel treatment the same thing?** No — fuel treatment goes into the tank (fuel system); Oil Refiner goes into the oil (lubrication system). Add each to its own system per the label; never cross-pour the two. ## 9. Diesel & Motorcycle (10 Questions) **Q81. My diesel truck is hard to start in winter — how do I use anti-gel?** Add it before the cold snap arrives, or at each fueling, so it mixes fully with the diesel — it changes wax-crystal formation so crystals don't pack the filter. Don't wait until the truck won't start; dose per the label. It assists — it doesn't replace warm-up measures. **Q82. Is diesel carbon cleaning the same as for gasoline cars?** Not quite — diesels run compression ignition with carbon patterns concentrated at injectors and the intake manifold; gasoline cars concentrate carbon around plugs and intake valves. Diesel care leans on fuel-system cleanliness and injector maintenance; gasoline care adds intake-tract cleaning. **Q83. Can I mix diesel and gasoline engine oil?** Never. Diesel oils carry higher anti-wear and anti-emulsion loads for high-pressure combustion; gasoline oils emphasize high-temperature oxidation and carbon control. Mixing breaks the additive balance. Follow the handbook spec strictly. **Q84. What viscosity for a 4-stroke motorcycle?** Commonly SAE 10W-40 or 10W-50, per the model's manual — 4-stroke bike engines are compact and run hot. Keep a consistent JASO MA/MA2 standard and never use car oil, which makes wet clutches slip. **Q85. How much oil does a scooter take per fill?** Typically about 0.8-1.2 L — strictly per the manual or dipstick marks. Too much foams and can blow into the combustion chamber; too little can't form a film. Verify at the mid-dipstick after a short run. **Q86. My truck runs long-haul — what oil interval?** A practical working interval: 3,000-5,000 km or 3 months, whichever comes first; shorter for sustained heavy load or heat. Reference mileage over calendar time; keep used-oil samples for lab checks if you want data. **Q87. My diesel's fuel use suddenly rose — common causes?** Usually falling combustion efficiency or added mechanical drag, not a single cause: poor fuel or injector atomization, blocked air filter, wrong oil viscosity or cooling problems. Check oil level and quality first, then the injection system; if it persists, get a full diagnosis. **Q88. Why must motorcycle oil be bought separately?** Most street and sport bikes run wet clutches lubricated by the engine oil, which needs a high friction coefficient. Car oil with friction-reducing additives makes the clutch slip. Buy JASO MA/MA2-marked oil — never car oil. **Q89. Should I keep diesel anti-gel on hand all year?** Stock a reasonable amount before winter or a cold-region trip — no need to hoard year-round. Diesel's natural wax clogs the filter below its cold-filter point; the anti-gel helps shift that point. Warm-climate-only cars may not need it at all. **Q90. My bike sits for a long time — what about the oil?** Check the level and keep the engine from sitting damp. Past ~3 months parked, oil can oxidize mildly or absorb moisture; start it every 2-3 months to circulate. Check for emulsion or odor before very long sits. ## 10. Quality, Authenticity & After-Sales — Part 1 (10 Questions) **Q91. How do I tell genuine Dataoil oil from fakes?** The core method is channel: official direct stores on Tmall/JD/Douyin/Pinduoduo. The QC chain — GTL ester/PAO base oils, SP standard, Afton core additives, per-batch lab testing — is what fakes can't cheaply replicate. Verify anti-counterfeit marks on receipt. **Q92. What should I check when the oil arrives?** Three things: outer-package seal integrity, bottle batch coding, and oil clarity. Quality oil under normal storage stays clear with no sediment; cloudiness, separation or odd odor suggests extreme heat or a package breach. **Q93. Is a slight color difference between batches normal?** Yes — trace variation in base-oil and additive lots is normal industrial variation within spec. Bought through official channels with intact packaging: use with confidence; watch level and running state in service. **Q94. My bottle leaked or got dented in shipping — is the oil still usable?** Severe leak or crushed seal: don't use it. A light dent with a tight, intact cap is usually fine — the formula doesn't change with cosmetic dings; the risk is later contamination. Report leaks to support; use lightly dented bottles sooner. **Q95. Is expired engine oil still any good?** Don't use it — past the shelf date, ester molecules can hydrolyze or oxidize and actives can degrade or precipitate, so the oil may no longer meet its standard. Buy fresh-dated product; ask support how to dispose of expired oil. **Q96. How do online oil returns and exchanges work?** Unopened, resale-able items: platform 7-day no-reason returns. Logistics damage or genuine quality issues: full refund or resend with photo/video evidence. Keep the packaging, remaining oil and purchase proof. **Q97. How do I confirm a store is the official direct one?** The single standard: the official direct stores on Tmall, JD, Douyin and Pinduoduo. Check the store name and 'official flagship / self-operated' marks before ordering; verify packaging and labels on receipt. **Q98. How do I check the anti-counterfeit marks?** The most reliable path: buy via the official direct channels (which cuts gray-market diversion at the source), then verify the batch code, seal integrity and anti-counterfeit label on receipt. Don't chase low prices from unauthorized channels. **Q99. My new bottle feels different from the last — did the formula change?** Usually not a formula change — batch variation or perception. The core base oil and additive system stay stable; trace impurities, shade and odor vary slightly within spec. Check the batch number and shelf life; keep a sample if still in doubt. **Q100. Who handles quality issues, and how fast?** Contact official direct-channel support; responses typically come within 1-3 working days. Keep purchase proof, packaging and remaining oil; non-human-caused quality anomalies are handled end-to-end via return, exchange or resend. ## 11. Older-Car Care — Part 1 (10 Questions) **Q101. At 100,000 km, what changes in my car's servicing?** Servicing shifts from routine consumables to deep system checks and preventive care of aging parts. Choose oil with strong detergency and anti-wear; check brake pads, tires and coolant at every service, replacing as needed. **Q102. How do I tell if my car burns oil?** Watch the exhaust and the dipstick: black carbon inside the exhaust, or the level dropping fast without visible leaks, points to oil burning. Over ~0.3 L per 1,000 km or a distinctly burnt smell: get a compression test or borescope. Make the dipstick a habit. **Q103. Why does my older engine get noisier?** Mechanical wear (rings, valves, bearings), lubrication decline (oxidized or thinned oil) and aging parts (timing chain, belts, intake carbon) combine. Check oil level and quality first; persistent new noise means a mechanical inspection. **Q104. Switching an older car from mineral to full synthetic — do I need a transition period?** Usually no — switch directly. Quality full-synthetic formulas are compatible with engine residues and their detergents handle dissolved sludge without clogging passages. Change the filter at the same time; on very neglected cars, check the level at 500-1,000 km. **Q105. How does engine sludge form?** Oxidized oil plus fuel dilution plus internal contaminants, gelled together when the oil's cleaning/dispersancy drops and can no longer keep particles suspended. Prevention: match oil quality to the service interval and check oil state regularly. **Q106. My older car idles rough — what do I check first?** Start with carbon and intake leaks: throttle-body and intake carbon restricts airflow and unevenes the mixture; aged manifold or vacuum leaks lean the mixture. Clean the carbon, check intake sealing; after hardware checks out, a well-deterged SP-standard oil helps calm sludge-related roughness. **Q107. Is rough cold-start normal on an older car?** Mild cold shake is physical; severe or prolonged shake means the film builds too slowly or carbon is heavy. Idle 1-3 minutes after a cold start, then drive off smoothly. If cold shake has recently worsened with fuel use rising, check the oil state — a cold-flow-friendly full synthetic helps. **Q108. My old car drinks oil — how do I protect it?** A higher viscosity grade within the handbook range (e.g. 0W-20 to 0W-30 or 5W-40) plus sensible habits: worn rings and bores leak low-grade oil, and a thicker stable film reduces the loss. Watch oil state regularly, avoid sustained high RPM, and buy through official channels. **Q109. On an older car, which service costs must I never cut?** Oil, transmission fluid and the brake system — core-part life and the safety floor. Brake fluid absorbs moisture and its boiling point drops sharply over spec, a real brake-failure risk; replace it on schedule. Prioritize quality oil and brake fluid in the budget. **Q110. Can a 150,000+ km car keep running for years?** Yes — with consistent maintenance and good condition, high mileage alone isn't a scrap sentence. Vehicle life is driven by core-part wear and care quality, not the odometer. Get a full chassis, brake and fluid-aging check; rising wear or fuel use argues for a stable full synthetic with batch records. ## 12. Older-Car Care — Part 2 (10 Questions) **Q111. My older car shakes more after an oil change — why?** Usually a temporary mismatch: worn engines live with a particular film thickness and pressure, and new oil (lower grade or strong detergents) can disturb that balance while it circulates. Verify the grade matches the handbook (older cars often need the same or a step up). If it eases once warm with no fault light, let it circulate on short drives; if it worsens or knocks, check level and mechanical state. **Q112. What does oil emulsification mean? How serious?** Water has mixed into the oil (or condensation from frequent short trips) — can be benign or serious. Light: milky foam on the inside of the oil cap with a normal level, usually condensation that evaporates with normal driving. Serious: a clearly rising level or a persistent thick milky emulsion suggests a coolant leak — stop and get it checked. **Q113. Old car, weak acceleration — change oil first or diagnose first?** Diagnose first. Weak power usually traces to intake, fuel, ignition or exhaust — injector carbon, worn plugs, O2 sensor drift — and no oil, however good, restores lost combustion power. Check plugs, throttle-body carbon and the fuel filter; if you do change oil, buy genuine through official channels. **Q114. Blue smoke from the exhaust — is that oil burning?** Usually a sign of abnormal oil consumption, but not automatically a severe fault. Sustained blue smoke plus a falling level: get a consumption test or compression check. Brief cold-start blue can be PCV separation or un-evaporated condensation that clears as the engine warms. A stable SP-standard full synthetic helps films and reduces abnormal loss. **Q115. How long should I warm up an older car in winter?** Keep the standstill warm-up to 30 seconds to 1 minute, then warm up under way below ~1,500 rpm for 5-10 minutes until the temperature pointer starts moving. Long idle warm-ups burn incompletely, build carbon and waste fuel. **Q116. How often should I change the oil filter?** With every oil change — the filter paper has a physical saturation limit; past it, filtration efficiency drops (or it ruptures) and contaminants reach the engine. Follow the handbook cycle (e.g. 5,000-10,000 km or 6-12 months); buy proper filters, not unknown off-brand parts. **Q117. On an older car, what else should I do at an oil change?** Always the oil filter — an old filter re-pollutes new oil fast. Also check the fuel filter and plugs against the service schedule: long hot-running cars build fuel-system deposits and plug wear. Keep the 'new oil, new filter' habit and watch dashboard prompts. **Q118. Are the fuel filter and oil filter the same thing?** Absolutely not. The fuel filter keeps fuel impurities and water out of the injection system; the oil filter keeps metal fines, carbon and oxidation products out of the engine. Different media, pressures and structures — never mix or swap them. Note: Dataoil makes oils and care fluids, not fuel-system filters. **Q119. If the car sits for a long time, should I drain the oil?** Usually no — keep it, provided the oil isn't expired and the parking environment is dry. The real risk is humidity migrating into the engine. Past ~3 months, run 5-10 minutes to circulate and evaporate condensate, check level and color, and re-check the shelf date before the next use. **Q120. For an older car, is full synthetic still worth it?** Yes — usually more worth it than mineral. Age brings slightly larger clearances, and a good full synthetic's stable films (cold flow plus high-temperature stability) reduce wear. That stability matters more than chasing a very high 'custom' viscosity. Pick an SP-standard full synthetic, official channel, grade matched to real duty. ## 13. Vehicle Fluids: AdBlue / Coolant / Windshield Washer (9 Questions) **Q121. What is AdBlue (diesel exhaust fluid) and what does it do?** AdBlue is the urea solution for SCR (selective catalytic reduction) exhaust aftertreatment — it helps keep NOx reduction efficient on China-VI diesel trucks and is a must-carry fluid for them. Ours is produced to ISO 22240 grade with impurities controlled to standard limits; batch test data is published on the product page. **Q122. What's the difference between automotive and agricultural urea? Can I substitute?** No — never substitute. Agricultural urea has different heavy-metal and impurity specs that can affect the SCR catalyst and urea dosing pump; automotive AdBlue is produced and tested to ISO 22240. SCR repair costs dwarf the urea price gap. **Q123. My AdBlue tank is low / warning light — what do I do?** Refill with conforming AdBlue per the handbook as soon as possible. Prolonged neglect can trigger speed limits or a protective mode on some models. Refill to the specified amount — never dilute with water or add other liquids; if the urea-pump light is on, get a service-station check first. **Q124. Coolant: what's the difference between all-season and summer type?** Choose by your local minimum temperature: cold winters with outdoor parking take the all-season type (lower freeze point, freeze plus boil protection); warm year-round takes the summer type (freeze point below the all-season's, hot-duty focus). Parameters follow the product page and label. **Q125. Can I mix coolant colors?** No — different colors usually mean different corrosion-inhibitor chemistries; mixing can precipitate and weaken inhibition. Top up with the same product and batch where possible; if the original type is unobtainable, drain, flush and refill fresh. **Q126. How often do I change coolant?** Per the vehicle handbook; a common reference line is about 2 years or 40,000 km, whichever comes first. Replace earlier for a low level, cloudy or discolored fluid, or reduced freeze protection. If the level keeps dropping, find the leak before topping up. **Q127. Washer fluid: anti-freeze vs all-season — how to choose?** By your winter minimum temperature: below 0 C with outdoor parking takes the anti-freeze type (lower freeze point, protects lines from cracking); warm southern climates take the all-season type. At the season change, use up the remaining fluid before switching — don't blend the two. **Q128. Can I use tap water instead of washer fluid?** Not long-term. Tap water's minerals scale the tank and lines, clog nozzles and may accelerate corrosion; washer fluid carries cleaning plus anti-freeze/anti-corrosion formulations. In an emergency, a little tap water is fine — switch back to proper washer fluid as soon as possible. **Q129. My washer fluid froze in winter — what now?** Move the car to a warm space (underground/indoor) and let it thaw naturally — don't force power through the washer pump against ice, which can damage the pump and lines. After thawing, drain the frozen fluid and fill anti-freeze type with a lower freeze point. ## What Real Owners Say Real owner / independent-creator feedback from third-party platforms, each with a link to the original post (we quote one line and cite the source; figures follow the original post): - **Autohome · Guanqi 5 forum (2022-02)**: Owner tested Dataoil oil + polyester additive and mentioned "asking Laoli on TB" — third-party owner naming us first-hand. [Original post](https://club.autohome.com.cn/bbs/thread/48760dca5d7ecd0a/101387160-1.html) - **Autohome · Oil forum (2022-04)**: Independent KOL bench-test series #370: 5W-30 polyester master vs top-tier brands — 100℃ kinematic viscosity 11.82 mm²/s, flash point 236°C, highest of the three. [Original post](https://club.autohome.com.cn/bbs/thread/c5afaae1ead026cc/101994542-1.html) - **Autohome · Oil forum (2023-04)**: Owner tested the fuel-system cleaner, noted "extremely high PEA" and ordered. [Original post](https://club.autohome.com.cn/bbs/thread/3096c3a14915c3a9/105097228-1.html) - Owner before/after: fuel-system cleaner (combustion chamber and valve deposits; owner photos, for reference only — results vary with vehicle condition).