Shock oil cSt / wt

Understanding cSt & wt

cSt (centistokes) measures kinematic viscosity. Higher values mean thicker oil at the same temperature. wt (weight) is a brand’s viscosity grade.

There is no universal cSt-to-wt formula. For example, 50 wt is 600 cSt for Traxxas and 710 cSt for TLR. Choose the brand on your bottle; this tool looks up its published label pairs.

How it feels

Compared with your current oil, using the same pistons, springs and temperature:

• Thinner oil: quicker, easier shock movement. Can follow small bumps better, but may feel bouncy or bottom out more easily.
• Thicker oil: more resistance to movement. Slows chassis pitch and roll, but can feel harsh on rough ground.
• Too thick: the shock may not extend fully between repeated bumps, leaving less travel for the next hit.

Start with the maker’s stock oil and change one grade at a time. Oil changes damping; it does not change spring stiffness.