Just to throw a wrinkle in this discussion, being motorcycles are wet clutch and use a common sump for the engine oil and transmission (excepting H-Ds and designs with separate trans like 2 strokes), what effect does the viscosity of the oil create? To make an extreme example, if you use a 50 weight oil vs a 10 weight, does this have any change? I would think the thinner oil would work better for minimizing slip, since it would be better able to squeeze out? The idea is to not have an oil film between the steels and friction plates the way I understand this? I hope that I am explaining this right.
Since an oil film would reduce friction, would oil with lower film strength enable higher torque before the clutch slips?
