It got to -50F or lower, most winters, where I lived in Canada’s northern territories. For one of those winters I had an air-cooled VW camper. It wouldn’t work at all, below about -30.
For a water-cooled ICE, you needed anti-freeze rated at -60F, or better. An electric block-heater was mandatory. Off-grid, I used a propane Tiger torch to heat the block, before starting & took the battery in at night. On-grid, I used a block-heater, an oil-pan heater, an electric battery blanket, and an electric interior pre-heater — all at once. Synthetic oil (combined with the oil-heater, on the really cold days) solved the viscosity problems.
Excellent suggestions if I ever find myself in the hinterlands. Thanks.
We had a block heater on our car once. Strange to see a power cord hanging out of the of the hood.
Way back around 90 years ago, my grandfather would empty the radiator on the ground at night and fill it up the next morning.