I like Amsoil. I am a dealer for Amsoil. However, anyone who says that one brand of oil is always better than another can sound somewhat ignorant. I get oil performance test results from Amsoil. It's true that it does outperform in most tests, however not all of them. So without getting into another full blown oil debate, run what you like, it's your bike. Just make sure it's the correct rating and follow the recommended maintenance schedule. As far as ATF goes, I know some guys who run it in there 2 strokes but that's not even close to the same scenario as a 4 stroke.