excuse me, but i just read that link. what a load of hogwash.
i personally have no opinion on AMSOIL. i do have one about companies that dance around the issue. there are two distinct problems going on here. 1) the issue of warranties 2)the issue of certifications (ie, meets or exceeds).
1) the issue of warranties is very clear. use an API graded oil with the OCI listed in the warranty or forget about your warranty. the M-M act says that you don't have to buy the OC's at the dealer not that you can take of for 40k without an oil change or dump API SA in the car and expect it to work. is it legal to deny a warranty claim due to OCI or type? until you can get a judgment otherwise, it is. i have done 3 lemon law claims in the past 15 years. i won two and lost one, and i put at least 80 hours of prep into each case, and also got master certified mechanic's written opinions twice (the one i didn't was the one i lost). i can tell you that you aren't going to win a lubrication related case (and that means if oil touches it, not if it was caused by) if they can prove you "abused" it. so you can then get a lawyer and try again, but your odds of winning are going to be pretty slim, and you will be out legal fees and car rental if you don't. showing up with a pretty AMSOIL letter is going to matter bumpkis with anyone. the entire process will take over a year. as my father got told in the 80's over a 350 diesel, "go ahead and sue, i have two floors of lawyers to take care of people just like you."
2)certification doesn't just mean API, it also means porsche, GM, FORD, etc. if they don't do the tests on each base oil reformulation, then it ain't. they can say meets or exceeds all day long..HOW DO THEY KNOW? more importantly, if they are changing the base oil so often, how do you know that what came in the last bottle is the same as what you got in this bottle? glad they don't make cat food...
so, at the end of the day it comes down to religion. either you BELIEVE AMSOIL, or you don't. if you do, and you are willing to bet your warranty, go ahead and put it in. if you are out of warranty, and you believe, then go ahead and put it in.
but, don't tell me "meets or exceeds". that's a free ride on the back of the folks that actually do the testing. M1, GC, PP all go through the hoops, not only on API, but VW 502 00, 505 00, 503 01; MB 229.1, 229.3, 229.5; BMW LL-01; GM-LL-A-025, GM-LL-B-025, etc. if amsoil doesn't, fine. just don't tell me "meets or exceeds unless the people running the programs have it listed.
"ahem. now, please be generous as we pass the plate, this morning's services at the First Church of Oil are now concluded. please refrain fisticuffs until you are outside the door."