Yokomo RP-08510KA Racing Performer Ultra #10000 Silicone Diff Oil for RC Gear Differentials  [RP-08510KA]

High-visc silicone designed for stable differential coupling

This Racing Performer Ultra diff oil is an RC-scale gear differential fluid formulated to handle higher drivetrain loads typical of current LiPo and brushless systems. The #10000 grade delivers a high-viscosity silicone core aimed at stabilising internal damping so the diff keeps a predictable response under prolonged stress.

Practically, the oil controls torque transfer between wheels, smoothing engagement on acceleration and managing slip through turns. Using a heavier silicone helps avoid abrupt jumps in diff action and maintains traction consistency from start to finish of a run.

Service guidance: when renewing differential oil, fully drain the old fluid, clean the gears and housing, inspect seals and bearings for signs of wear, then refill to the recommended level and reassemble. Run a few controlled laps so the oil evenly coats internals before pushing hard.

Tuning note: stepping up to a #10000 oil increases coupling of axle outputs and can suppress wheel spin under throttle, so consider corresponding suspension and driving adjustments to preserve the handling balance you prefer.