I also am not trying to defend Amsoil, just trying to answer questions. I have had the same conversation too many times. Changing oil ratios does change fuel mixture. In fact, I used to vary the Amsoil ratio in my 2 cycle off road motorcycles to compensate for rides at different altitudes. Tuning an engine for 32:1 and then changing to 100:1 will cause engine to run rich, it should be re-tuned. The same applies in opposite directions, except the result is too lean. I will also admit that running 100:1 and then tuning too lean is disaster in the making. But that applies to all oils, and is the responsibility of the tuner. I once melted a piston on Amsoil, but it was my fault because I forgot to rejet for the low altitude. 70 mph on dirt road with a locked up rear wheel was more fun than 3D. Maybe 100:1 is less forgiving of lean mixtures. For conservation sake, how is it that every oil has some who swear by it, and others who swear at it?

I think Amsoil should be more specific on their directions, maybe stating 80:1 provides better durability. I did call the tech service department, and they said 50:1 ratios are OK, but not recommended for Saber Professional. Dave at DA says he has seen TOC engines that fly every day for years at 100:1. Something is not adding up. May be it is not the oil, but the loose nut holding the little screw driver.

Amsoil does have a warrenty that states, if their recommendations are followed, and the engine is harmed by their oil, and you can provide evidence, they will repair / replace the engine. There are naturally some procedures, they want an oil sample and want to see the parts. So if the parts were in fact damaged, contact them for details. My motorcycle cylinder lasted 3 times longer then my riding buddies who used brand x. But that is another story. Let me know what happens.