True... oils are graded on gravity flow timed by a stop watch which is not a measurement of thickness nor weight....The oil viscosity at 100 C (212 F), aks "KV100", is the kinematic viscosity (units of cSt), which is based on how it flows due to gravity.
The "W" rating has absolutely nothing to do with the kinematic flow
True... in accordance with ASTM D-5293 it simulates viscosity when subjected to start up conditions at cold temps...
CCS (Cold Cranking Simulator)
Last edited: