This page deals with Liqui Moly brand oils
Liqui Moly is one of the most divisive oil brands among enthusiasts. Some people claim its products are magic, others claim snake oil. So, how does it stand up to lubricity testing?
N/A = NO ADDITIVES
M# = SQUID INK ADDITIVE MIX VARIATION
C# = CUSTOM MIX, SEE UNDER CHARTS FOR MORE DETAILS
Leichtlauf High Tech 5W40
Recommended blend: M5 or M7
SLR-3 Scoring ---
- N/A: 62.99
- M5: 85.86
- M7: 92.19
"Leichtlauf" (meaning "smooth running" in German) High Performance looks like a 20 weight oil under pouring and running conditions despite being labeled as 40 (an SAE rated 20 weight oil should be nearly 3 times as viscous as a 40 weight). It weighs 15.720 g per 20 mL. Most 30 weight oils are 15.250-16.000 g per 20 mL, so this oil appears to be more in the 30 weight range in terms of mass.
The base performance of LMLLHT is average at 30 minutes, but starts to degrade quickly after the 45-60 minute mark, rising to very high temperatures and required power at the 60 and 120 minute marks. The 120 minute wear scar was relatively large (a good base oil produces a wear scar nearly 50% of the size). However, with the M5 and M7 blends, significantly improved results were observed.
It has a very distinctive odor when heated. You can tell Liqui Moly Leichtlauf apart from other oils just by smell.
It has little/no residual film left on components after oil stops flowing. It flows easily and cleanly. However, it has poor dry-start ability, and each time weight was applied it needed to be applied very gradually to keep the testing machine from seizing.
Very high temps after the 30 minute mark and high energy usage leads to the assumption that this is not a "racing oil", in that its performance degrades under long and extensive stress.
It is worth noting that this rather expensive oil ($40-$60 per 5 quarts), and is only SN rated, not SN-Plus like many other oils in and below its price range.
This oil with no additives left the cylinder with rather large and deep scarring. This oil performed poorly for its price and deified reputation.