Polaris ATV Legend
Join Date: Feb 2009
Location: Washington State
trans and diffs should take the polaris oil. ive seen these componets get really messed up on aftermarket oil. a lot of people put a 75w90 gear oil in these, and by looking at what the AGL for the diff is, it looks way thinner then 90w at operating temperature. these cases hold such little fluid, it is less then $10 per change for the cases.
engine oil, coolant, grease, that kind of stuff is fine aftermarket. but please do yourself a favor and use the right stuff for the cases. nobody really knows the weight of the oil, and polaris will never tell.