It gets a little cold here in Minnesota also, but only for about 2-3 weeks will it stay below zero all of the time. Your engine is built for 10W30 and so long as you have a charged battery, there will not be a problem.
I do not advocte running the engine more than 30 seconds before shifting the car into R or D. The seat heater is for your comfort and the engine will begin to produce heat within two minutes of "easy" drive time.
Just remember, the tranny fluid will be very cold, so take it easy. At least you don't have to plug the car in when you get to work. There are a few Brickboarders in Fairbanks where it routinely gets to -50F, and plug in heaters are required and one attaches to the tranny.
If you use 5W30 and have a turbo, beware, the turbo seals are not going to be able to keep the light oil from getting to your intake. Plus, if you use dino oil, the thin oil will break down and evaporate once the engine gets hot. I have used 0W40, 5W30, and 10W30. The 10W30 stays in the engine, the other two have me adding a quart every 2K miles.
Klaus
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Just driving a 1998 V70R :)
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