First, feel free to hit with a "did you try a search?" hammer on the topic. My bike calls for 10w40 oil and the guy I bought it from thinks he used Amsoil. I read that ATF works best in these bikes and was wondering: Has anyone had any experience with ATF? Can I switch right now even after conventional oil has been used? Is Amsoil blue? Blue is what's in the bike now. Thanks all.