Yokomo RP-UDL Differential Lubricant for Ball and Small Gear Diffs  [RP-UDL]

High-performance viscous oil for RC differentials

This differential lubricant relies on a controlled silicone viscosity to manage traction and rotational smoothness in ball differentials and compact gear diffs. The formula is tuned for stable viscous damping so handling remains predictable during sessions without quick breakdown of lubrication.

Employ the product during setup to change the differential "feel": higher viscosity increases coupling for more pronounced drive feedback, while lower viscosity reduces internal drag for freer operation. It is marketed as a tuning fluid rather than a mechanical part, allowing fine adjustment of differential response for competitive or recreational use.

Application advice: place a small, precise amount onto ball carriers and racing surfaces inside the diff, work the mechanism through its range to distribute the lubricant, and then reassemble. Do not overfill, since surplus fluid will modify the intended damping curve. This description treats the item solely as an accessory for small-scale diffs.

Maintenance note: the formulation aims to limit rapid performance loss so differentials can remain serviceable for longer spans, reducing the frequency of full strip-and-clean routines compared with very thin oils.