Shock oil weight to cSt converter
Convert silicone shock oil between weight and centistokes.
Why two numbers for the same oil
Centistokes (cSt) is a measured viscosity: it means the same thing whoever filled the bottle. Weight (WT) is a label each maker chose for themselves, with no standard behind it — which is why the converter asks whose oil you have before it answers. Losi 30 WT and Associated 30 WT are not the same oil, and the gap is worth about two and a half points on the label.
It is not a straight multiplication either. Thin oils run near 10 cSt per point of weight and thicker ones nearer 13, so the converter follows each brand's published figures and works out anything in between along the line between them.
How much to trust it
These charts were measured and circulated by racers rather than certified by manufacturers, and two bottles of the same label can differ by a few percent anyway. So treat a converted figure as where to start a rebuild, not a specification: read the cSt off the bottle when it is printed there, and stick to one brand in your pit box so that what you learn about 400 cSt keeps meaning the same thing.