Either way an engine flush couldn't hurt, i've had good success (hasn't blown up my 1.8t and slowed consumption down) using liquimoly.
Pros: slowed consumption down
Vehicle:
Volkswagen Tiguan
Reviews of LIQUI MOLY engine flush
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Per olii&Co Liqui Moly \u00e8 una garanzia. E ogni tot prima di scaricare l\u2019olio gi\u00f9 con il loro engine flush.
Pros: \u00e8 una garanzia
MoS2, Ceratec, Engine Flush… I have own my mk7.5 since 30k miles, do my own changes, a flush every 3-4 changes, ceratec every other and MoS2 in the other. So far 120k going strong, have never had any issues. Knock on wood **
Pros: going strong, no issues
Vehicle:
Volkswagen
Mileage: 48280 km
I would recommend the engine flush made by Liqui Moly which you put in and run for 15 minutes, then dump out. it works quite well, and you might need to do a number of flushes to get most of it out.
Pros: works quite well
Vehicle:
Kia
I like this stuff. Used it on a new to me 100k mile BMW with the N52 engine. It had the notorious lifter tick at start up and randomly when warm. Used the engine flush on 3 consecutive 2500 mile oil changes. Cured the lifter tick.
Pros: cured the lifter tick
Vehicle:
BMW
Mileage: 160934 km
But this GTI is on E, sitting at 221k, and I’m already doing 3,500‑mile oil changes; the Liqui Moly Pro-Line Engine Flush is just extra insurance to keep the internals clean so the old girl keeps pulling hard.
Pros: keeps internals clean
Vehicle:
Volkswagen
Consider using Liqui-moly engine flush at the oil changes to help decarbonize the engine… especially the oil rings.
Pros: helps decarbonize engine
“Engine flush” from liqui moly, follow the instructions and check again.
Pros: check again
Their engine flush also reduced my car’s oil consumption and my car sounds much smoother on liqui moly oil so im a firm believer.
Pros: reduced oil consumption
Not on a sledged up engine but I’ve used it with success on my high-mileage BMW. Followed with Penzoil for a thousand miles or so.
Pros: used with success
Vehicle:
BMW
Mileage: 1609 km
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What we know about LIQUI MOLY engine flush
The brand is registered in Germany.
In March 2026, PartReview has a mixed opinion of LIQUI MOLY engine flush. PR Score — 90 out of 100, based on 36 reviews and 112 votes. 31 positive review, 4 neutral reviews, 1 negative review. Average rating — 4.4 (out of 5). Votes: 101 up, 11 down.
Users also evaluated the qualities of LIQUI MOLY engine flush:
- Idle smoothness - engine can idle a bit more evenly after use - rated positively. 4.3 points out of 5.
- Drain appearance - old oil drains darker and thinner as deposits are loosened - rated positively. 3.9 points out of 5.
- Smoke change - temporary exhaust smoke may appear during or after treatment - rated negatively. 2 points out of 5.
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