Friction modifier in engine oil?

by Alex

Expert answer:

Quick answer

Generally not advised. Engine oil has its own additive chemistry to handle combustion and lubrication. LSD friction modifiers can disrupt engine wear protection and cause performance issues. If you want low-friction properties in your engine, pick an oil designed for engines rather than LSD-specific additives.

Detailed answer

Friction modifiers for limited-slip diffs or gearboxes aren’t formulated to handle the combustion byproducts, heat ranges, and detergency needs of an engine. By pouring LSD friction modifier into engine oil, you risk misaligning the carefully balanced chemistry that keeps pistons, cam lobes, and bearings protected.

Why It’s Not Good

1. Different Friction Goals: Engines require friction in some spots (rings seating) and minimal friction in others (bearings). LSD additives reduce friction in ways that might compromise ring seal or valvetrain contact.
2. Chemical Incompatibility: The detergents, dispersants, and anti-foam agents in engine oil might not mix well with gear-type modifiers.
3. Possible Deposits: Some LSD additives could form unwelcome deposits under the different thermal conditions of an engine.

Are There Engine-Specific Additives?

Yes, some oil brands include friction-reducing components like moly or esters formulated specifically for engine use. However, those differ from LSD friction modifiers in composition.

Consequences

– Decreased protective film on bearings.
– Weird sludge or varnish formation.
– Potential seal compatibility issues.

What If I Already Did It?

Drain and replace the engine oil ASAP. Better safe than sorry. Long-term use of LSD additive in an engine could lead to accelerated wear.

Conclusion

Putting friction modifier in engine oil is a big no for most applications. Engines need specialized lubrication, not LSD-type slip control. If you want lower friction in your engine, pick a modern synthetic or an oil with verified friction modifiers specifically meant for engine environments. LSD additives belong in your differential, not your crankcase.

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