The Yokomo RP-113250 RP Ultra Shock Oil #25 is a silicone-based shock fluid made for RC shock absorbers and supplied in a colour-coded yellow 40cc bottle. The RP Ultra series now offers narrower viscosity increments so you can dial in compression and rebound more precisely without changing internal components.
Practically, viscosity alters damping speed and character: higher numbers raise resistance for slower compression and rebound while lower numbers quicken the response. Using a medium grade like #25 is a regular choice for those balancing track stability with steering sensitivity, and the yellow coding lets you switch oils quickly during tuning.
When testing shock oils, keep left and right volumes matched, bleed air thoroughly and check shaft action to avoid inconsistent results. The RP Ultra labeling and fine viscosity progression make it easier for modelers to isolate small handling changes.
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