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Anything will keep you warm, it's gone to -41C now, at this temperature the tires freeze in the shape that they are with flat spots at the bottom so it's a bit noisy when you pull away. Heat wave on Monday as it's going up to -22C, should be able to stand outside then!
If you go north of us to Yellowknife, about a days drive, it's -61C and that freezes your eyelids to your eyeballs. You never turn your engine off as except for oil changes, if you do, you have about 15 minutes to restart it or forget it until Spring or drag it inside somewhere and plug it in to the mains (block heater) The grease in the wheel bearings changes to rock hard gunge so if you live there you have to have synthetic grease.