I run a full synthetic 10w40 motorcycle oil. It is rated for high temperature . I use it because my Tahoe will sit in the summer heat running for hours. It is an amazing oil. Holds 40psi at hot idle.
After a fast idle or driving down the road, the oil cooler sheds enough heat to raise it to 45-48 psi at idle.
10w40 synthetic is still great in the winter. No ticking, instant oil pressure, etc. I’ll always run it.
I run 15w40 diesel oil in my Jeep 4.0. It’s thick and has a tick when cold until it starts flowing well. It’s cheap though, I don’t mind it. It doesn’t break down easily.
