The Yokomo RP-085075A Racing Performer Ultra diff oil #7500 is a silicone lubricant intended for radio-controlled gear-type differentials, formulated to provide steady damping and lower internal friction during prolonged use. The #7500 viscosity grade is presented as a tuning choice to influence slip and locking characteristics without changing gear geometry.
In tuning practice, heavier diff fluids raise the resistance to differential action and create a firmer locked effect when accelerating or exiting corners, while lighter fluids allow the driven wheels to differentiate more freely. The RP-085075A #7500 is a heavier option for setups needing stronger centre lock feel or reduced differential spin in low-traction scenarios.
Installation guide: open the differential housing, drain the old fluid, check gears and bearings for wear or debris, then top up with a precise amount of diff oil suitable for your differential type and tuning aims. Cycle the assembly after filling to clear air pockets and ensure smooth operation prior to reinstalling in the chassis.
Service advice: renew diff oil according to running time and inspection results, and avoid mixing different silicone oil formulas inside one differential unless compatibility is established, as differences in additives and base chemistry will affect performance.
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