The Yokomo RP-113250 RP Ultra Shock Oil #25 is a silicone damping fluid for RC shock absorbers, presented in a yellow, 40cc container. The RP Ultra range has been refined with closer viscosity steps so small changes to compression and rebound can be made without swapping internal parts.
Functionally, the oil affects damping rate and driver feel: thicker grades raise damping resistance for slower compression and rebound; thinner grades reduce resistance and speed response. A mid-grade such as #25 is commonly chosen to strike a compromise between steady handling and nimble reaction, and the color coding simplifies swaps while testing setups.
For tuning, focus on matching oil between left and right, performing a proper air bleed and checking shaft movement to avoid trapped bubbles that upset damping. The RP Ultra labels and reduced viscosity jumps support stepwise tuning for enthusiasts who want predictable changes.
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