Diesels don’t like the severe cold. Battery warmers and block heaters for sure. Synthetic oil really does make a difference with gas engines. I plug my yukon in when it is around zero (however not when parked when I am at my cabin). My old 7.3 does not like it when it is below zero. Some people run diesels most of the time if it is really cold. You can buy used ones from the North Slope that have low miles, but have been running lots of time.
Some work places provide plug-ins here.
Colder than -30F is brutal on machinery/hydraulics, so places like Fairbanks hold off on snow removal and trash pick up when it gets brutal.
