That might be true for lower end Amsoil products, but not of Signature Series oils, or Saber 2-stroke. There are different grades of Amsoil - not all of it is sky-high expensive. Just the top shelf stuff. It's expensive because it uses the best of everything.
I run my stuff HARD, whether it's my 2-stroke motorcycle, flying my paramotor, or running hand-held outdoor power equipment (OPE) - I have 2-stroke engines that are over 20 years old that still have over 100 PSI compression. My paramotor head temperatures kiss 400° on climb-out for a few minutes. I run Saber at 66:1 in the paramotor - 100:1 in everything else. The 2-stroke RD350 gets Dominator 2-stroke, since Saber is a little to heavy for the injection pump. Would be mixed at a higher ratio than is necessary anyway, so Dominator is fine for that application. 7k HARD miles - super hot idling in traffic, and frequent trips past the stock 7k RPM redline - on it since a complete overhaul, and the engine has the same compression as right after break-in.
On all my 2-stroke stuff, carbon buildup is almost nonexistent. Compared to other good synthetic oils I've run in the past, it is night and day different in cleanliness.
All my customers got Amsoil in both 2 and 4 stroke equipment. One customer had put almost 700 hours on a box-store rider, and when I tore the engine down to replace leaking gaskets, the pistons and cylinders looked virtually brand new. Perfect crosshatch pattern still visible in both cylinders, with no scuffing on pistons.
I could care less about advertisements. Real world stuff like this is what sold me. It's not that other oils won't work - I just want the best of the best in my engines, since I don't have the time anymore to be wrenching on my own stuff.
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