jplante4 wrote:
It is far worse to run an engine at idle or high idle for 10 minutes every once in a while than it is to just let them sit. If you must warm up the motor, run it down the road and let the engine temp. come up to normal. This boils off the moisture in the oil. I did this last winter until the middle on January when the roads got covered with salt, then left it alone until April.
Good advice. At an idle, a diesel will not get up to operating temp like a gasser will. Either let it sit...or run it.