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Amsoil recommends ONLY using oil grades which OEM recommends for warranty. If you pick another grade you are on your own and outside of Amsoil official recommendation! At this time it is only Amsoil 5W30 which is GM Dexos 1 Gen2 certified and as such it is the ONLY oil Amsoil recommends for LT1/4 Camaros (and also stipulates one uses their filter as a requirement). There are also clear limitation as to long change intervals based on actual usage, etc. Dexos is not any "minimim standard". It is THE standard. Read how Amsoil describes specific tests GM requires for Dexos certification. Their words not mine btw. Amsoil will not take any OEM to court on your behalf and pay hundreds of thousands for litigation - that's a pipe dream. Read their warranty: it is all there in small print detail as to what the warranty covers (and does not cover), how and with what limitations and specific requirements on you - the consumer.
Bottom line: if you wish your motor (5yrs) and your emissions (8 yrs) warranty intact, use what GM specifies as approved oils in owner's manul (based on type of duty). And that's exactly what Amsoil's official position is as stated on their own website. Cheers!
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