I have done UOAs with Amsoil, pennzoil and mobil 1. You are absolutely right, theyre all top shelf, hogh quality oils and have had no issues with either. Ive used Mobil 1, castrol (not a fan), RP (if you want an oil thats all hype there you, least Amsoil doesnt claim youll gain HP) and Pennzoil, PP and M1 being my choice if i dont have amsoil on hand. Look use whatever your comfortable, but you really wont be dissapointed with the Amsoil, plus you can get a MANN filter and NGK plugs from the same order as well. I push my product because, yes, i make money off it. Some of which goes towards supporting this site. Im sorry if any of you have been annoyed by the advertising, il keep in the vendors forum, but sometimes our products can help certain issues. Amsoil is basically in the same league as M1 just a smaller company that focuses on making a great product and letting the dealers do all the selling.

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Do your car and move up to Amsoil.