Reviews of LIQUI MOLY engine flush

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Based on

36 reviews and 112 votes

112 votes

Average rating ? The average rating is calculated only from review ratings, without votes
4.4
Idle smoothness:
4.3
Smoke change:
2.0
Drain appearance:
3.9
31
4
1

36 reviews

Description
LIQUI MOLY
Germany
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LIQUI MOLY Engine flush
  • Idle smoothness:
Rating 5.0

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
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LIQUI MOLY Engine flush
  • Idle smoothness:
Rating 5.0

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
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LIQUI MOLY Engine flush
  • Drain appearance:
Rating 4.0

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
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LIQUI MOLY Engine flush
  • Idle smoothness:
Rating 5.0

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
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LIQUI MOLY Engine flush
  • Idle smoothness:
Rating 5.0

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
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LIQUI MOLY Engine flush
  • Idle smoothness:
Rating 5.0

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
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Reviews of 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:

  1. Idle smoothness - engine can idle a bit more evenly after use - rated positively. 4.3 points out of 5.
  2. Drain appearance - old oil drains darker and thinner as deposits are loosened - rated positively. 3.9 points out of 5.
  3. Smoke change - temporary exhaust smoke may appear during or after treatment - rated negatively. 2 points out of 5.

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