AMSOIL doesn't believe in paying GM and others money and putting the time in to get on 100's of manufacturers lists. No manufacture requires an oil to be on the list in order to keep warranties intact. If GM required an oil on their list to be used, GM would have to provide it for free. Money and time wasted. But AMSOIL offers oils that meet GM's specs, and never had a warranty issue.quote:Originally posted by Big Bear:
Tim, how come Amsoil isn't on GM's approved list? Even there API certified XL Series? Even some of these small no name companies made it.