Upgrade Diff Oil #7500 for RC Gear Differentials - Yokomo RP-085075A  [RP-085075A]

Tuned silicone lubricant for diffs

The Yokomo RP-085075A Racing Performer Ultra diff oil #7500 is a silicone-based lubricant designed for radio-controlled gear-type differentials, offering consistent damping and lower internal friction under continuous loading. The #7500 viscosity is a specific tuning option to affect slip and locking behavior while leaving gears unchanged.

From a tuning perspective, heavier diff oils raise resistance to differential action and encourage a more locked feel when accelerating and exiting corners; lighter oils permit freer wheel differentiation. The RP-085075A #7500 is a high-viscosity option for setups that want a stronger centre lock sensation or reduced differential spin on low-grip surfaces.

Installation notes: disassemble the differential housing, drain the old lubricant, inspect gears and bearings for signs of wear or debris, then refill with the correct measured amount for your diff type and tuning goals. After filling, rotate the differential through its range to expel trapped air and check for smooth operation before reinstalling in the chassis.

Maintenance tip: change diff oil according to running hours and inspection outcomes, and avoid mixing different silicone formulations in one differential unless you have confirmed compatibility, since additives and base fluids can affect the final behavior.