Reviving an old thread, what ever came of this did the truck last you?
I purchased a 2022 1500 Denali 6.2 and my oil pressure is roughly 18-20psi fully hot idle 20k miles.
my best friend who owns his own performance shop and builds ls and even done modern lt motors says it’s completely normal with the variable pump and low idle (500rpm). He claims I should run 5w30 ATLEAST, but I’m still on 0w20 for warranty reasons. My theory is every truck is different and aslong as your above 10psi idle and 40 cruise 60 WOT you’re in the green. But I’d love to hear from OP on how his truck is or was doing.