Funny you should say that (go to THEIR website) They pay for the testing and their website wouldn't endorse anything but their product as being the best. Next will come the "white pages" links etc that will get removed pronto. I have seen enough of that garbage to last more than one lifetime, it's nothing more than a pyramid scheme to make money and recruit poor souls into selling their product through brainwashing.
Yeah, I don't like amsoil, the company or the way the jobbers and dealers try to push the product on every forum on the net.