Pet Peeve #87: Idle damn diesels all the time.
They can start and stop just as well as anything. There is no reason why they can't.
Stupid *holes with diesel vehicles tend to let them idle for hours on end. Why? Damn thing has a starter right???
Only exception I can see for that is when it's -40F out. Even then, shut 'er off and restart in an hour or so for a while.