I run Alaska trips through canada and bought an 18 cascadia with dd15 (save that opinion lol) because i needed some better mpg. That being said in 10 to -45 degree temps the truck stays running 24 hrs and when sleeping 8 hours I find the 600rpm idle the motor cools down and oil pressure is very good and the dpf filter doesnt fill up and no dpf regens but if i high idle the filter gets full and regens and obviously uses a lot more fuel. If I am able to stay warm at low idle with my webasto…
Cold weather idling DD15
