I would like to share some thoughts. First older diesels rattle severely and of course also quite loud. They also spew black exhaust and smell badly. Newer diesels that haven't been tuned or DEF delete don't smoke ,smell and all three if stock are extremely quiet.
My new 2020 Duramax has a larger rad, larger fan and new improved oil cooler.
The manual states if you have been working hard to let the engine idle at least 10 Minutes. If you shut it down to early it will automatically start itself back up. As previously mentioned to hot of oil will take the bearings out of the turbo and the vanes rub the case and the debris goes through the engine. that results in $20,000 for an engine.
On behalf of the big diesel pushers the air pressure gauge only shows what is in the primary and secondary tanks. It is not fully charged that fast as it still has to fill brake chambers etc . Spring brakes start to come on at 60 psi .but they don't release at 60 psi. Many States have no manditory air brake endorsement so you have to bear with the procedure they go with.