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Why would it make any difference? That's another thing I have always wondered about - that diesels have to be left running all the time.

So what is the purpose of the start-up five minutes? To make sure that the oil is warm enough to flow if it was a freezing cold start? So the turbo bearings and seals see only warm oil once the turbo starts spinning fast?

Thanks for the replies and advice. Now I have a variation. Let's say I just want to move my Deuce from here to there, like out of the garage into the driveway sort of thing. Do I need to run it for 10 minutes total? Or can I start it up, move it in low range without pressing the gas pedal, and...

Thanks for the responses so far. I have been using a variant of USAFSS's 'lollygagging' technique. Yes, you can burn up five minutes that way easy. I also, as some have mentioned, will do easy driving - such as pulling out of my garage with the truck in low gear and low range, without touching...

How do those of you that daily drive a Deuce do it? Here's what I mean. The plaque on the dashboard say to idle the engine five minutes after starting before driving, and to let it idle for 5 minutes before shutdown. Ostensibly, this is to let the turbo bearings nicely warm up and cool down...