I've run Torco SSO, Yamalube, Maxima Tundra, Castrol, Amsoil (HP, not Interceptor), and Klotz. The best of the bunch for me was Amsoil. Slight to no smoke with warm engine, and smelled good. Surprisingly, Klotz smoked alot, but smell was good. The exhaust was much more black and carboned up with Klotz as well. Torco was pretty thick when cold, and had a slight burnt smell. Yamalube smelled bad and smoked quite a bit. Maxima and Castrol were alot like Yamalube.