I asked that same question about a block heater and I had my 2001 2.7l Box in an unheated garage with no block heater. It even started at -35C or about -30F with no problem.
As the above posters say 0W 40 synthetic oil (Mobil) works for me. Start it and warm it up, then a couple of minutes drive away gently to till it warms up. Surprisingly good winter driver till the snow gets too deep(more than 2-3 inches) and then it drags on the bottom of the car.
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