If you want to know more than you ever thought you would want to know go here: http://www.bobistheoilguy.com/forums/ubbthreads.php

There is a motorcycle forum towards the bottom. Heavy duty diesel oils look for a CI-4 or CI-4+ 15w-50. Passenger car oils look for SJ or SL 20w-50 or 20w-60 if you live in a hot area-- mineral or synthetic.

NEXT PUNTER!