The Yokomo RP-113250 RP Ultra Shock Oil #25 is a silicone damping fluid for RC shock absorbers available in a yellow 40cc bottle. The RP Ultra range has been updated with finer viscosity gradations to permit more granular alterations to compression and rebound without changing hardware.
In use the oil changes damping response and feel: higher viscosity increases damping resistance leading to slower compression and rebound, while lower viscosity shortens response time. A middle option such as #25 is often chosen to balance stability and agility, and the colour code aids quick swaps during setup sessions.
When evaluating shock oil choices, ensure symmetrical oil levels, remove trapped air with careful bleeding and confirm smooth shaft travel to avoid inconsistent damping. The RP Ultra labeling and tighter viscosity spacing simplify iterative setup work for both competitive and casual modelers.
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