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Here's the truth: "zero" weight oil is a marketing gimmick, and manufacturers recommending ultra thin oils is a strictly concession to the hyper fuel economy agenda, rather than longevity of your engine
On the flip side, 40+ weight is too heavy for any street engine (and questionable benefit for a race engine). GM's call for 40+ in the Camaro is strictly to mitigate oil starvation during high G loads when cornering with a wet sump. It again has nothing to do with engine longevity and those thick oils are have terrible cold flow properties. Who knows, may be a contributor to oil pump failures
Run 5W-30 or 10W-30 in any engine and you will be fine. Turn off the noise. My brother worked for GM Advanced Vehicle Engineering over 30 years
Dexos is bs, don't worry about it. Amsoil Signature exceeds any standard out there
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