I wonder if these "tests" are just another way that Amsoil can justify its high cost? When you look at the other products that Amsoil offers, like Donaldson filters, I can get Donaldson filters locally for 30% lower than even the Amsoil preferred customer pricing. This makes me wonder on the price of their oil also. No doubt it is a fine product for some applications, but is it that much better? Not so sure.