It's TERRIBLE to just idle a cold engine though. oil is viscous as fuck and oil pressure is only lower when the engine isn't running at all. Far better to just drive the damn thing (takes about 20min of driving to recover from the start), or plug in a battery tender.
But a Good battery, as in one younger than about 3 years old and never allowed to go flat, shouldn't have any problems with a month of no-starts in -40 temps which still being able to start the engine.
Could always install a damn block heater and let the engine have an advantage (use a coolant heater and you have instant heat too, though that'll go away unless the radiator is blocked off)
LOL - I used to live at the top of Superior, where block heaters and jumper cables are standard equipment:)
I have since moved South a bit.
You know you are in a for real cold part of the world when every parking spot comes with it's own electrical outlet.
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