Lots of the use of the words "it depends", it does depend. Sometimes it depends upon a lawyer, or a regional manger, and how good a fighter you are. All the while the car sits useless.
As far as Amsoil sometimes paying out as "Goodwill" they'll put a limit on how good their Goodwill is! If it is big Bucks, it will be handed right on over the their legal dept.
MFG suggested approved oils, and their suggested intervals are your best bet till the warranty runs out.