how many miles before the thing wears out?
I suspect there are quite a few that will make 500,000 miles
dude!!! you serious?!
Engine life is a lot like gas mileage, “your mileage may vary”. But 500,000 should be possible if well maintained and not abused. My observation based on service and delivery truck use is that the engine is about the last thing that wears out, the rest of the truck falls apart first.