One winter, I spent 30 days when the temperature never got above -40 C (which purely by coincidence is the same as -40 F). Dropped to -46 C several days and nights. With full winter fronts (covering the radiators) the Ford trucks we used wouldn't warm up. We needed belly tarps in some cases, as there was too much airflow around the engines, ie covering the grills wasn't enough. Didn't matter if they were diesel or gasoline, and it was worse at idle or with no load.

The real problem was that the Explorers had the steering racks down low, away from the engine heat. The fluid in the racks went solid after a period of time in the straight ahead position (like driving down the highway), so as you drove, every now and then it would be as if the steering column lock was stopping the steering wheel from turning. Lots of fun.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue