The Yokomo YOKRP-085250 Ultra Shock Oils #25 Racing Performer serves as a silicone shock fluid for RC-scale dampers, intended to help set and tune damping characteristics in silicone-filled shocks.
As a tuning medium, changing the fluid viscosity modifies rebound and compression rates by adjusting how the oil flows past pistons and orifices, allowing fine control over suspension response without altering hardware.
Service shocks in a controlled area: remove old oil completely, inspect internal parts such as pistons and seals for damage, then refill with the selected viscosity and perform consistent test runs to compare results. Label and record each viscosity used to replicate preferred setups later.
Approach viscosity swaps methodically, combine them with spring or shock position tweaks, and judge the impact with short, repeatable tests so you can isolate the effect of the oil change on handling.
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