[The Newell]

One caution for this thread: "idle" and "fast idle" (about 1000 RPMs on most diesel engines) are not the same in terms of wear and lubrication concerns.

I've seen (or rather heard) truckers run their engines all night when its cold to keep the cab warm. Have always wondered about that in light of the numerous warnings about long idle times. On the other hand, truckers are human and Just because they do something doesn't make it a good thing. Besides, if my choice was freezing my butt off or causing some extra wear on the engine, that engine is in for a rough night!