Yokomo RP-UDL Racing Performer Ultra Diff.Lube differential lubricant for ball differentials and small gear diffs  [RP-UDL]

High-viscosity diff lubricant for RC use

This RC-scale diff lubricant is built around controlled viscosity to tune traction and smoothness in ball differentials and compact gear-type diffs. The formulation emphasises stable viscous damping so setups maintain predictable behaviour during track sessions without rapid breakdown of lubrication.

Use in setup and tuning to increase “feel” from the differential: higher viscosity increases coupling between halves for more drive feedback, lower viscosity reduces drag for freer rotation. The product’s role is as a tuning fluid rather than a mechanical modification, letting you fine-tune differential response for race or practice.

Application notes: apply a small, measured amount to the ball carriers and race surfaces inside the differential, work the unit through its range to distribute the fluid, then reassemble. Avoid overfilling; excess fluid can change the intended damping curve. This description treats the item strictly as an RC accessory for small-scale differentials.

Maintenance advantage: the lubricant is formulated to limit performance deterioration so the differential can remain in good condition over longer service intervals, reducing the frequency of strip-and-clean cycles compared with thin oils.