# Buyer Voices - Dataoil (老李化学)

> Page: https://laolichem.com/en/reviews.html

**What the Dataoil buyer voices archive is:** This page is what buyers said — not what we say. Below are screenshots of buyer reviews and photos from the review sections and product detail pages of our official direct-run stores on JD / Pinduoduo (archived September 2026, 31 images in total), covering five product lines: the 9000 series, Polyester Master, motorcycle oil, Youth SN/SP, and the Yixiangqing gasoline additive. Each image is labeled with product, platform and date. Quotes are translations of the original Chinese text visible in each screenshot; the screenshots themselves are unmodified. The full review sections are public — visit the corresponding official store to read more originals and follow-up reviews.

Archival scope: only verified screenshots are archived on this page; reviews reflect individual driving experiences, and results vary with vehicle condition, mileage and driving habits.

## 9000 Series (GTL ester · OEM formulation)

Common signals: repeat-purchase badges (store purchases ≥2 / ≥10), quiet idle, 4.6L capacity fit (no 4+1 top-up needed).

1. "After the oil change the engine runs noticeably smoother, idle vibration has clearly reduced, and power delivery on the highway is more linear. Great value — I'll keep choosing this one for future oil changes. I've been buying from Lao Li Chem for a long time; reliable and affordable." — 9000 series 5W-30 SP 4.6L · Pinduoduo · 09-24 · store purchases ≥10 (img/reviews/9000-r1.webp)
2. "I've been using this oil for several years now. Economical, and the quality is good. I've checked the engine internals at every oil drain — they're still in very good condition, which tells me this oil's quality is worth trusting." — 9000 series 0W-20 SP 4.6L · Pinduoduo · 02-04 · store purchases ≥2 (img/reviews/9000-r2.webp)
3. "The value of Lao Li Chem oil is unreal! Ester full-synthetic formulation, API SP certified, 4.6L is exactly enough with no waste. Cold-start protection is on point, idle is quiet, and highway fuel economy improved even. Even the mechanic says this oil is good — I'll definitely buy it again!" — 9000 series 5W-30 SP 4.6L · Pinduoduo · 06-27 · store purchases ≥10 (img/reviews/9000-r3.webp)
4. "My Volvo XC60 is now at 120,000 km — a 10-year-old car. I used to run Castrol Magnatec; now I service every 10,000 km and it's going well. Added the fuel-system cleaner and the car drives a bit easier — smooth, light throttle." — 9000 series 0W-20 SP 4.6L · Pinduoduo · 03-17 (img/reviews/9000-r4.webp)
5. "Received the oil. This is already my third time buying from Lao Li Chem — I used this one last time and it felt good: engine noise is down, it feels more fuel-efficient, and acceleration has more punch," — 9000 series 5W-30 SP 4.6L · Pinduoduo · 2025-10-16 · store purchases ≥2 (img/reviews/9000-r5.webp)
6. "I used it myself with no problems, so when a colleague asked me to recommend a cheap and practical one, I recommended this one to him too. The 4.6L volume fits his car exactly — no need to buy 4+1 like with other brands. This looks like the best-value ester oil out there. That's that." — 9000 series 5W-30 SP 4.6L · Pinduoduo · 01-22 · store purchases ≥2 (img/reviews/9000-r6.webp)

## Polyester Master (premium, polyol-ester base oil)

Common signals: long-term use across multiple cars (up to 4 cars / 20 cartons, ~10 years), 10,000 km service intervals, reported fuel economy.

1. "Very good oil. I've bought twenty cartons of Lao Li Chem oil — all four of my cars use it. It works well, and you don't have to worry about counterfeits. Genuine product, fair price, very good." — Polyester Master 5W-30 4L · JD · 2025-11-19 (img/reviews/master-r1.webp)
2. "I've been using Lao Li Chem oil for several years. Stable quality, changed every 10,000 km … 5.8 L per 100 km fuel economy." — Polyester Master 0W-20 4L · JD · 2025-11-17 (img/reviews/master-r2.webp)
3. "I feel quite at ease with Lao Li Chem's oil — I've used it for about ten years, and my turbo engine has basically never burned oil. Both of my cars now use this oil. At the very least, oil from an official channel can't be fake. Lao Li Chem grew from an ordinary store to a Tmall flagship. I've been following it all along." — Polyester Master 4L · JD · 2025-10-23 (img/reviews/master-r3.webp)
4. "This oil is great! After switching, engine noise is lower, power is strong, acceleration is smooth, and fuel economy improved. All-season use is so worry-free. Great value — I have to recommend it to fellow drivers!" — Polyester Master 4L · JD · 2025-11-22 · second purchase · follow-up review after 5 days (img/reviews/master-r4.webp)
5. "Fit: 0-20 suits Mazda CX-5; lubrication: fuel economy noticeably improved, works very well; using Lao Li oil and additives long-term for over 10 years; professional product, very good quality, trustworthy, recommended! Quality: synthetic motor oil;" — Polyester Master 0W-20 4L · JD · 2024-11-16 (img/reviews/master-r5.webp)
6. "Been using it for several years and it's been good the whole time. From Youth to Master grade, I have to buy a few bottles every year — engine oil, fuel booster, Yixiangqing. This time I bought it for someone else; fast shipping, fresh date, I'll keep buying!" — Polyester Master 4L · JD · 2025-01-08 (img/reviews/master-r6.webp)

## Motorcycle Oil (10W-40, three grades)

Common signals: wet-clutch use, 4,000–6,000 km change intervals, quietness and smoothness.

1. "Received the Lao Li Chem motorcycle oil 10W-40 full synthetic 4T SN MA2 1L. This is my second time using this full-synthetic oil — good quality, lasts 5,000 km, and the engine sounds pleasant and quiet after the change. Not bad." — Motorcycle oil 10W-40 4T SN MA2 1L · JD · 2026-09-15 (img/reviews/moto-r1.webp)
2. "My UY has been using this oil all along — 30,000 km now, changed every 4,000–5,000 km." — Motorcycle oil 10W-40 · JD · 2026-08-15 · 5-star review (img/reviews/moto-r2.webp)
3. "Changed it every 2,000–3,000 km on the scooter. The effect is very good — at 100,000 km the engine is still going strong." — Motorcycle oil 10W-40 SL · Pinduoduo · 2026-02-01 · 3 group-buys of this item · official store replied (img/reviews/moto-r3.webp)
4. "I use Lao Li Chem oil often — the value is very high and the service is excellent. The bike runs silky-smooth and saves fuel after using it." — Motorcycle oil 10W-40 SL · Pinduoduo · 2026-03-05 · 3 group-buys of this item (img/reviews/moto-r4.webp)
5. "After switching to this oil the engine runs much more quietly, vibration is clearly reduced, and throttle response is lighter. On high-temperature long-distance rides the oil viscosity stays stable, lubrication is good, it reduces internal carbon build-up, and clutch shifting is smooth. Genuine oil, strong anti-oxidation, longer drain interval — great value for daily commuting, worth repurchasing." — Motorcycle oil 10W-40 · JD · 2026-07-14 · 5-star review · official store replied (img/reviews/moto-r5.webp)
6. "I've been using Lao Li's products for years... I even used it in my gasoline car. That car is now electric. The motorcycle keeps going." — Motorcycle oil [scooter oil] Super 4T 10W-40 · Pinduoduo · 2025-06-25 · 2 group-buys of this item (img/reviews/moto-r6.webp)

## Youth SN (entry-level ester)

Common signals: mixed fleet use (Haval / VW / Toyota), 5–6 years of continuous use, older-car scenarios.

1. "The key thing is it works on any car. I have three small cars — Haval, VW, Toyota — and I put this oil in all of them. Serviced around every 8,000 km. I've been using it for six or seven years. No problems at all. Very good." — Youth 5W-40 SN 4L · JD · 2025-11-02 (img/reviews/youth-sn-r1.webp)
2. "I've been using Lao Li's oil for 8 years — as good as always. Wishing you a thriving business." — Youth 5W-30 SN 4L · Pinduoduo · 2026-01-30 · 3 group-buys of this item (img/reviews/youth-sn-r2.webp)
3. "I've been using their oil for 5–6 years. The engine is quiet and in good condition." — Youth 5W-30 SN 4L · Pinduoduo · 2026-01-19 · 2 group-buys of this item (img/reviews/youth-sn-r3.webp)
4. "Very good oil — outstanding value, reliable quality, and I keep using it. The older the car and the higher the mileage, the more the oil's advantages show. Positive review!" — Youth 5W-30 SN 4L · Pinduoduo · 2026-01-04 · 3 group-buys of this item (img/reviews/youth-sn-r4.webp)
5. "I've been using this oil since 2015, from old beat-up cars to new cars, always using it. It's good — give it a try if you need it." — Youth 5W-30 SN 4L · Pinduoduo · 2026-03-01 · 2 group-buys of this item (img/reviews/youth-sn-r5.webp)
6. "Very good, trustworthy. Every car in the family uses Lao Li oil. I always recommend it to friends and have bought it many times..." — Youth 5W-40 SN 4L · Pinduoduo · 2026-04-25 · 3 group-buys of this item (img/reviews/youth-sn-r6.webp)

## Youth SP

Common signals: cross-category repurchase (gear oil / additives / engine oil all from Lao Li Chem), 4+ years of continuous use.

1. "It's been over a decade — I've always used Lao Li's oil. Good oil." — Youth 5W-30 4L · JD · 2026-09-07 (img/reviews/youth-sp-r1.webp)
2. "You can see Lao Li Chem products everywhere in our company. I'm a loyal fan — from gear oil to additives to engine oil, it's all Lao Li Chem. I've used their products for many, many years, and they're as good as ever. No big-brand premium markup; Lao Li Chem's oil offers high value for the price." — Youth 4L · JD · 2025-03-08 · follow-up review after 18 days (img/reviews/youth-sp-r2.webp)
3. "The oil quality is genuinely good. I change it once a year at service — the engine noise has dropped, power is strong, and I've been using it continuously for four years. Good quality! The seller's service attitude is good too! Worth buying!" — Youth 4L · JD · 2026-01-08 (img/reviews/youth-sp-r3.webp)
4. "The oil is very good — power increased, fuel economy dropped" · Follow-up review after 1 day: "Third time buying. Changed it at over 6,000 km this time; it's been a year since last change, so I changed it. The oil is fine; mainly the price is favorable. Changed it at a repair shop, labor fee 40 yuan. Still support our brand." — Youth 4L · JD · 2025-03-08 · third purchase · follow-up review after 1 day (img/reviews/youth-sp-r4.webp)
5. "The oil is very good, I've always used this brand. Wear-resistant, plenty of power" · Follow-up review after 6 days: "Always use this brand, very easy to use. Bought two barrels, will buy again next time." — Youth 4L · JD · 2026-01-10 · follow-up review after 6 days (img/reviews/youth-sp-r5.webp)

## Yixiangqing Gasoline Additive: Before/After & Follow-up Reviews

Boundary (same scope as FAQ q13): effective on newly formed, lightly deposited carbon; limited effect on hardened, heavy carbon — that requires professional in-shop cleaning. The following are JD review-section screenshots (including follow-up reviews); before/after photos are owners' borescope / in-cylinder shots. Individual results vary widely; this is not a promise for every vehicle.

1. "The PEA works really well … the carbon is basically all broken up!" · Follow-up review after 2 days: "The in-cylinder carbon is basically all broken down — the effect is excellent!" — Yixiangqing 300mL · JD (img/reviews/yixiangqing-y1.webp)
2. "Third time buying Lao Li Chem's Yixiangqing. The last few photos show the effect after 3 bottles — very good. I've tried many other brands before; the effect wasn't great. I'll keep using this one." (The screenshot also includes: a borescope piston-carbon test review, a 2025-06-25 review, and a follow-up review after 162 days saying "effect is very good") — Yixiangqing 300mL · JD review section screenshot (img/reviews/yixiangqing-y2.webp)
3. "Good effect. Lao Li Chem is worth recommending — I've bought it multiple times." — Yixiangqing 300mL · JD · 2026-01-10 · 5-star review (img/reviews/yixiangqing-y3.webp)
4. "It really works. A 2015 Elysee at 120,000 km, two bottles, real test — now the power is clearly much better than before" (the screenshot also includes 6 photos of the owner's borescope / in-cylinder shots) — Yixiangqing 300mL · JD · 2026-01-10 · 5-star review · owner-verified test (img/reviews/yixiangqing-y4.webp)

## How to Verify It Yourself

1. Store entry points: Tmall [老李化学旗舰店 (Dataoil Flagship Store)](https://laolihuaxue.tmall.com) / JD [老李化学京东自营旗舰店 (Dataoil JD Self-operated Flagship Store)](https://mall.jd.com/index-1000095045.html) / Douyin [老李化学三角湾汽车养护专卖店 (Dataoil Triangle Bay Auto Care Store)](https://v.douyin.com/6C8-qw8rSSg/) / Pinduoduo [老李化学官方旗舰店 (Dataoil Official Flagship Store)](https://mobile.yangkeduo.com/mall_page.html?ps=hpKMeAdNVY) — official direct-run; recognize this store.
2. Public review sections: check the reviews and follow-up reviews under the corresponding product in any official direct-run store; the screenshots on this page can be matched against the originals one by one.
3. Originals on file: the 33 screenshots on this page, together with the unselected source material (89 images, archived September 2026), are kept on file by product line, date and SKU, and originals can be inspected on request.