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You will never push even the most base conventional motor oil that meets Dexos1 for MY2012 (which supercedes GM6094M or GM4718M) requirements, to it's limits. So I don't get the need to spend big bucks on oil that you won't really get any perceived benefit out of... Other than longer drain intervals.
I know people get passionate about oil and I get it if you have a race car or some specific need that you're addressing, but in a DD, with a run of the mill GM small block V8, any oil that meets Dexos1 will work fine.