Yokomo RP-UDL Viscous Diff Lubricant for Ball and Small Gear Differentials  [RP-UDL]

Precision viscous diff fluid for RC use

This RC-scale diff lubricant uses controlled silicone viscosity to adjust traction and smoothness in ball differentials and compact gear-type diffs. The formulation focuses on consistent viscous damping so setups behave predictably during track sessions without rapid loss of performance.

Use it as a setup and tuning fluid to increase differential "feel": thicker viscosity raises coupling between halves for stronger drive feedback, while thinner fluid lowers drag for freer rotation. The item functions as a tuning aid rather than a mechanical upgrade, letting you refine differential response for racing or practice.

Application notes: place a small, measured quantity on the ball carriers and races inside the differential, move the assembly through its travel to distribute the fluid, then reassemble. Avoid overfilling because excess fluid will alter the intended damping curve. This text treats the product strictly as an RC accessory for small-scale differentials.

Maintenance advantage: the lubricant is formulated to slow deterioration in damping performance so the differential can remain serviceable for longer intervals, reducing how often you need to strip and clean compared with thinner oils.