Ran a hotel for 6 years in MT where -40 was common in winter. Truckers without plugins would run the engine every 2-3 hours for 15 min. Never saw that fail but plenty that didn’t bother couldn’t get started the next morning.
Good luck.
“Truckers without plugins would run the engine every 2-3 hours for 15 min.”
Well, I’ll remember this thread if, heaven forfend, I’m ever in such conditions. But you don’t get much rest having to do that, do you?