Ideling with these DPF’s.....

I don't think it makes any difference what speed you idle at with current DPF systems. You're going to probably have to do a manual regen regardless. So, do us all a favor and idle at normal speed and save some fuel and some noise and see what happens tomorrow morning. Won't know until you've tried both methods.

[I assume you drove under a good load for at least several hours today to help purge the particulate filter and get back to "normal"? If not and if you're just idling for multiple days straight, good luck with that]

 

Nope. That’s the way it is. About all you can do is experiment at different rpm, 900, 1000, 1100 , etc. No matter what rpm you run, it will still need to do a Regen at some point as the exhaust temp is still no where near what it would otherwise be going down the road with a load on.
The only difference various rpm will make is whether it makes it to morning before needing a Regen, then you would be able to just head out onto the highway and let it do it going down the road.
It doesn’t hurt anything to just shut it off when it’s really cold out if you don’t need to go anywhere. As long as you have a block heater that can be plugged in or have an engine pre-heater to warm it up before starting.

 

Wha kind of truck is it?
New Detroit’s have an ECU parameter called AutoElevate. It allows the truck to go ahead and do a Regen on it's own if it requires one. They don’t normally have that parameter set from the factory in case you put a pto on the truck, you don’t want it to start raising rpm unexpectedly.

 

I have a 17 cummins I idle up to 1100 and after a ten hour break I turn off the cruise it regens by it self for about 20 minutes then I’m good to go.

 

400 K miles and the DPF hasn't been cleaned? You are nearing the end of the service life on the DPF. It's mostly full of crap, and can't hold enough to idle through the night without a regen.

My guess is the problem will go away if you get the DPF cleaned.

 

I'm sorry, but can't fathom anyone today buying a $130k truck with a sleeper and not at least adding a webasto type bunk heater. But then I again, I can't see working in a position where sleeping in the truck is possible some nights and the truck is not outfitted with a working APU