I wasn't trying to convert no one to Amsoil, he asked a? And I gave him my opinion. What BDS is telling him is a bunch of crap, and far as I know you don't have to use what they say or lose the warranty. GM and Ford tried that and lost. a blower on a truck lub. with motor oil, and run for hrs. without a problem. its a fact Amsoil has the best # of any motor oil, in all catalogers, but that's not the reason I use it, I have a friend in Rich. that drinks it for dinner, and I buy it from him to help him out and I believe its a good oil. I've used more Pennzoil than anything. I'd start with whatever they wanted me to and then change it sometimes later if i wanted to.