Quick answer
Usually not recommended. Power steering and hydraulic systems require fluid with specific viscosity and anti-foam properties. Adding LSD friction modifier can disrupt pump function, seal compatibility, or valve operations. If you need better steering feel, use the correct OEM fluid or an approved alternative, not LSD additives.
Detailed answer
Power steering and general hydraulic systems differ drastically from gearboxes or LSD-equipped diffs. They rely on precise fluid dynamics to transmit pressure, steer, or operate hydraulic cylinders. Pump seals, valves, and hoses are tuned to a particular fluid spec.
Why Not
– Risk of Seal Swelling: LSD friction modifier chemicals may degrade or swell seals not designed for them.
– Foaming/Viscosity Issues: Power steering fluid typically includes anti-foam agents; an LSD modifier could upset that balance.
– No Benefit: There’s no clutch chatter to reduce in power steering.
If You’re Experiencing Noise
Power steering noise often stems from low fluid level, air in the system, or a failing pump. The fix is usually bleeding or using the correct fluid, not adding LSD friction modifier.
Conclusion
Friction modifiers belong in LSDs and certain gear systems, not power steering or generic hydraulic circuits. If your steering squeaks or groans, follow the proper fluid spec or address mechanical issues. LSD-type additives can do more harm than good in these systems.
