Reviews of LIQUI MOLY oil additives

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25 reviews and 76 votes

76 votes

Average rating ? The average rating is calculated only from review ratings, without votes
4.6
Engine noise:
4.6
Smoke:
4.8
Response:
4.3
24
1
0

25 reviews

Description
LIQUI MOLY
Germany
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LIQUI MOLY Oil additives

Lately, I’ve been diligent about using Mobile 1 synthetic instead of generic oil and have done some changes like buying top-tier fuel, 87 octane, which has detergent in it. I’ve gone so far as to do some fuel additives like Techron and have added LIQUIMOLY to an oil change.

Pros: diligent oil changes
Vehicle: Honda
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LIQUI MOLY Oil additives
  • Engine noise:
Rating 4.0

I have used it for the last few oil changes on my N55, can say it did seem to make the valve train a little bit quieter to my ear, and did see a small decrease in oil temperature, but I also did switch from 0w30 to 5w40 with the additive.

Pros: quieter valve train
Cons: aluminum shavings in filter
Vehicle: BMW
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LIQUI MOLY Oil additives

Been using this plus Liqui Moly Ceratec in my 2001 BMW E39 for the last 12 years (118,750 Miles) and it stoped my oil burning (1 qt every 15 hundred miles) to almost 0.

Pros: stopped oil burning
Vehicle: BMW
Mileage: 191112 km
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LIQUI MOLY Oil additives
  • Engine noise:
  • Smoke:
Rating 5.0

Night and day for VW guys. Makes the ea888.3 silent and stops it consuming oil. If I don\u2019t run MOS2 my 160k tuned example sounds like a can of nails on cold starts.

Pros: makes engine silent
Cons: noisy on cold starts
Vehicle: Volkswagen
Mileage: 160000 km
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LIQUI MOLY Oil additives
  • Engine noise:
  • Response:
Rating 5.0

Using 10W40 Mos2 from Liquid Moly in my M42 and M44 engines since a few years. First time i used it was when i replaced the oilfilterhousing gasket. And o Boy did the engine smooth Out a Lot.

Pros: engine smooth out
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LIQUI MOLY Oil additives
  • Engine noise:
  • Smoke:
Rating 5.0

Not a BMW owner, but it completely eliminated oil consumption in my 100K mile Volkswagen EA888Gen3 engine. One quart was disappearing every 1500 miles or so. Now the dipstick doesn't change at all between 5K mile oil changes. I add it with every other oil change to Mobil1 5W-40 Euro.

Pros: eliminated oil consumption
Cons: oil looks filthy
Vehicle: Volkswagen
Mileage: 100000 km
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LIQUI MOLY Oil additives

That might just molybdenum in the oil.

Moly is basically flakes of metal and appears glittery.

Some oil has a significant amount of moly. Liqui-Moly MoS2 additive has lots of molybdenum and has caused owners to panic.

Pros: molybdenum appears glittery
Cons: owners panic
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LIQUI MOLY Oil additives

I’ve had great luck with Liquid-Moly additives to reseal & decrease oil consumption. Really great product. Doesn’t work for everything, but it’s worth a shot.

Pros: decreases oil consumption, reseals
Cons: not always effective
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Reviews of LIQUI MOLY oil additives

The brand is registered in Germany.

In March 2026, PartReview has a mixed opinion of LIQUI MOLY oil additives. PR Score — 97 out of 100, based on 25 reviews and 76 votes. 24 positive reviews, 1 neutral review, 0 negative reviews. Average rating — 4.6 (out of 5). Votes: 74 up, 2 down.

Users also evaluated the qualities of LIQUI MOLY oil additives:

  1. Engine noise - idle becomes quieter and smoother if the additive helps - rated positively. 4.6 points out of 5.
  2. Smoke - exhaust smoke may reduce, making driving more pleasant - rated positively. 4.8 points out of 5.
  3. Response - throttle feels slightly smoother during takeoff - rated positively. 4.3 points out of 5.

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