Well we will have to agree to disagree on the AMSOIL, like I said I have had 40+ years of experience with it never had an issue even when I was racing two stroke dirtbike‘s in motocross 125, 250, and 500cc. never had a ring failure in all that time and never had to rebuild with new rings and pistons like other guys in the racing circuit that did it quite frequently because they were using the Dino two cycle oil and I always mixed it 100:1, these motorcycles were high rev motors 14k rpm’s especially in the 125. I had such good luck with the Amsoil products that I became a Amsoil dealer 30 years ago I don’t know about your claim about a lawsuit, being an Amsoil dealer all these years I’ve never heard anything about it.
A very close friend of mine owns a logging business and they run Stihl and Husqvarna chainsaws and he has been using AMSOIL his entire career (30+ years) in all of his companies saws and never had a failure related to oil. I did call him this morning to talk to him about this issue he thinks it is probably the coil so I will replace that he did tell me that because they are running saws all day long at high RPMs he mixes his oil ratio with Amsoil at 80:1, so I may try that. Thanks