So diesels dont like to sit....

PenMan wrote:
I've seen a couple of posts in this thread that say not to idle a diesel. Wonder why my owner's manual says to idle mine to warm it up when cold? Like 3 to 5 minutes.

Cause you want to make sure you have good oil pressure and that the oil getting everywhere it should be before taking off. Cold oil takes a while to circulate through out the engine.

But extended idling is not good for a diesel because the fuel can wash down the cylinder walls and cause premature wear of the walls, rings, and pistons. Plus that fuel will find it's way into the lube oil and dilute it. Bump your idle up to 1200 rpm and there is much less chance of any damage.