Except for a couple of their oils, Amsoil neglects to test and certify. That API seal of approval is extremely important, especially when your warranty requires it.
Verification of its performance through API certification testing, and the lack of MLM nuts flogging it in every automotive newsgroup on the planet.
Come on. You're not actually defending quackery like "Male Power Formula" and "Longevity Enzymes", are you?
Please forgive me. When a guy selling crap like this tells me I can run his super oil for several times my car's normal oil change interval, I have a hard time taking him seriously.
The only joke I see is how worked up you guys get when somebody insults the object of your affection.