I never found anything wrong with Amsoil but all my engines ran very well with other oils that I could get just about anyplace and for a lot less money. Most all auto and motor cycle shops have synthetic or blended oils. My Brisons called for synthetic at 100:1 and I think I had more of a problem with that then the engines. I don't like having to order oil either and wait for it to get here. The Klotz is a blended synth and even has castor in the blend. My LHS has it in stock too.
I used to run Amsoil in my sand dragester, even there trans fluid, I loved the stuff but just couldn't afford to keep using it.I also had a good discount on the price back then but it was still high dollar.