GM probably doesn't care if your motor makes it to 200,000 miles, just past the warranty. I would run the best brand oil possible and for a close tolerance V8 5W20 would be my go to. If it had a lot of miles then 5W30.
My LFX gets the 0W16 for direct injection motors.
Yeah, GM used the wrong oil in these too. 
Edit- 0W16 not 0W6.
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Last edited by xstuntman; 11-29-2021 at 12:34 PM.
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