Yokomo RP-085075A Racing Performer Ultra diff oil #7500 differential silicone oil for RC differentials  [RP-085075A]

Precision diff silicone oil

The Yokomo RP-085075A Racing Performer Ultra diff oil #7500 is a silicone-based lubricant intended specifically for use in radio-controlled gear-type differentials, formulated to maintain consistent damping and reduce internal friction under sustained load. The product is presented as a tuned viscosity option identified by the #7500 label to influence the slip and locking characteristics of a differential without altering gear geometry.

In practical tuning terms, heavier diff oils increase resistance to differential action and produce a more locked behaviour during acceleration and corner exit, while lighter oils allow freer differentiation between driven wheels. The RP-085075A #7500 provides a higher-viscosity choice for setups seeking stronger center lock feel or reduced differential spin in low-traction conditions.

Installation overview: remove the differential housing, drain existing lubricant, inspect gears and bearings for wear or debris, and refill with a measured amount of diff oil appropriate to your diff type and setup practice. After filling, cycle the differential through its range of motion to eliminate air pockets and verify smooth operation before reinstalling the unit in the chassis.

Maintenance notes: replace diff oil at regular intervals based on running frequency and signs of contamination, and avoid mixing different silicone oil formulations inside a single differential without confirming compatibility, as additives and base chemistry can affect performance.