Seems to me any company with an R&D department the size of Exxon/Mobile, Castrol, or Shell ought to make a good oil. My brother and I shared a VW Bug in college way back when, we put a zillion miles on the thing, it always got Castrol, though not as often as it should, and the body rusted out before the engine gave any signs of trouble. On the other hand, Shell synthetic is sold at the local "buyer's club" at a very good price these days, so that's what the bikes and the cars get. (Even the "airhead BMW" bike.