Real informative, fed! As a mechanic who works on air-cooled engines every day of the week, I can say that Amsoil does live up to at least some of its claims. My boss won't run anything else in his equipment. I soon found out why.
I recently popped the valve covers on a couple of the Kawasaki air-cooled engines in his fleet to reset the valve lash, and they practically fell apart once the bolts were taken out. Underneath, there were no stains, debris, burnt spots, or discoloration. I didn't damage a valve cover gasket, either. The engines looked new inside, and only needed the valves reset by less than .010".
These motors have been run 8-10 hours a day, at full (governed) throttle (3,300RPM) all summer long, for at least 4 years and counting. For an engine which is designed to last about 2,500 hours, yet is still running like new at 2K with no smoking or oil consumption, I'm impressed. Can't argue with oil performance like that. I just got ahold of some Amsoil Interceptor oil for the Blaster and can't wait to switch from Bel-Ray and try it. It will be tested. Hard.