How cold to leave running ?

Back when I worked at a fleet shop we let everything run all winter. Most drivers we had were boneheads and no matter how much you tried to beat it into them to leave the trucks running at 1200 RPM they would just leave them sitting at low idle. Every night before going home I'd have to walk the yard and bump up the engine speed on most of the trucks. We lost a C12 that winter because some bonehead left it idling for a week straight over Christmas. Usually get about 36L of oil out of the pan at service time. Figured I drained about 85L of oil/diesel out of the pan when I brought it into the shop.

 

You gotta run em up to 11 or 12 or they'll barely keep you warm in the sleeper

 

Enlighten someone not as smart as you. Why no defrosters?

 

20f,,, I idle truck. Or wake up 5 hours and warm truck.
Don't like to cold start on the road.

 

-35f this morning in norther MN had to leave my dodge run it was starting to gel with winter blend and anti gel had to use some 911 to get it to loosen up.

 

Because the hot defrost on an extremely cold windshield will possibly crack the windshield. Happened to me.

 

When I would take truck home for home time I always plugged it in and started it the next day.On the road I never shut it off and used powerserve.

 

Hmmm. Makes sense.

 

So when you are idling you supposed to bump up the rpm? Sorry I am new to idling. Been running team. But solo now.