I guess I mis-spoke. What I should have said is that: To my knowledge, no claims have ever had to be paid. I have no idea what legal battles may or may not have been fought to make that claim. As for no reported failures being a more accurate description---If I ever had an engine failure--with lubrication being suspect--with any oil, I would be getting a sample analyzed immediately. To not do so would be just plain stupid.
I don't think a company which has been around for over 30 years, continually expanding over that time, would be in existence if they put out 'borderline' products which stuck it to the poor dimwitted buyer. There would have been many failures and they would have been rightfully sued and out of business early on. Ron, I think you're right about exceeding the OEM drain interval while under warranty. I think the Viper book calls out a 7500 drain interval for my car. I ususally go a little over 6,000. I probably did take a little risk with my other new vehicles as I changed them over at about 5,000 miles and went the extended interval--using oil analysis. Of course, I was driving these vehicles over 40,000 miles a year so the warranty was up in 10 months. As for using Amsoil at all while under warranty....I don't believe the warranty can be voided if the oil meets the stated criteria for use---and it does.
Anaconda........from your highly charged opinion of direct marketing techniques, I would have to think that you, or someone you know, was burnt bad by some unscrupulous company. That's too bad, but horror stories abound across all sectors of the business world from people that have been screwed or taken advantage of in some way,shape,or form....and never justly compensated. From what I've read, direct marketing helps fuel the engine that drives the economy of our country forward. Personally, I've chosen to earn a living much more conventionally.
In regards to which oil may be better: I can only refer you to do a search from a few years ago on the subject. My tracked and autocrossed 6,000 mile oil pretty much beat a babied Mobil 1 batch with much less mileage on it. The analysis results were interpreted by the oil guru himself, who is personally no fan of Amsoils for many of the reasons stated above.
BTW--Tom uses diesel oil in his car which I'm sure would have some impact on a warranty, were one in effect and a failure occur.
This is a worn out, beat up subject which takes up way too much time. Every once in a while, for some foolish reason, I dive back in.
Steve