In regards to AMSOIL not paying under their warranty...
I think it should be noted. A dealer cannot deny warranty work because you run any oil for any service length unless they prove that the oil usage caused the failure. Ie, even if you run 100,000 mile oil changes the dealer can't say that your tranny failure was the result of your poor maint.
AMSOIL's warranty is specific for oil related engine failures. Their decision not to pay for engine problems that are documented or have numerous reported failure areas based on a design flaw seems reasonable to me. Eg. there are some Dodge/Chrylser engines that are known to sludge and have poor oil circulation. AMSOIL or any other oil manufacturer should not be liable if an oil sample pulled at the catastrophic event shows the oil was still within service specs.
All of that being said, unless one wants to have ALL work done at a dealer, and use ONLY dealer parts and fluids then you might find yourself in a catch 22 position. HOWEVER, even if you do all of these things, a dealer still may tell you that you have ABUSED the vehicle with the way you use it.
Find a product you like, use it, and hopefully the engine will last longer than the car body.
The week is half over !!!!