Liqui Moly MoS2 Anti-Friction Engine Treatment

Liqui Moly MoS2 Anti-Friction Engine Treatment suspends molybdenum disulfide (MoS2) solid lubricant particles in a heavy paraffinic petroleum carrier. MoS2 is a layered crystalline material: under shear, its molecular layers slide against each other, depositing a low-friction boundary film on metal surfaces that persists even when the oil film temporarily thins (cold starts, high-load conditions). This mechanism is well-documented in tribology peer review; the chemistry class scores significantly better in the evidence hierarchy than PTFE or undisclosed "nano" formulations. The Liqui Moly product is marketed for all 4-stroke gasoline and diesel engines, with or without turbochargers, and the label confirms compatibility with catalytic converters and DPF/GPF particulate filters — making it one of the few oil additives positioned for modern vehicles without the phosphorus caveat that applies to ZDDP products. Community data on BITOG shows consistent positive reports of reduced engine noise and smoother operation, though no used-oil analysis comparing wear metals before and after has been published for this specific product.

Best for owners of modern 4-stroke gasoline or diesel engines who want a supplemental friction modifier and have confirmed their base oil doesn't already include a robust organomolybdenum additive package. Also appropriate for high-mileage or older engines where reducing friction at cold-start is a priority. Skip it if your vehicle's OEM oil specification already includes a moly-based friction modifier (many European-spec and Japanese OEM oils do) — you are unlikely to see additional benefit from a duplicate chemistry. The strongest use case is engines that run on mineral or conventional oil without factory moly content.

The SDS (WHMIS 2015 / OSHA HazCom 2012 compatible, Revision 2019-11-01) classifies this product with a WARNING signal word and a single H-code: H336 (STOT-SE Cat 3 — may cause drowsiness or dizziness from the petroleum carrier vapors). There are no skin-irritation (H315), eye-irritation (H319), or aspiration-hazard (H304) classifications at the mixture level — the SDS §11 toxicology data confirms no adverse skin or eye effects for this product. During the pour, working outdoors or with the garage door open addresses the H336 vapor concern; a closed garage with engine heat increases vapor concentration and is the relevant trigger scenario. The SDS classifies no aquatic toxicity at mixture level (fish LC50 >100 mg/L). As with all petroleum-based fluids mixed into engine oil, used oil goes to a collection facility — not down a drain or storm sewer. Most automotive retailers and municipal hazardous waste programs accept used oil at no charge.