LOL
Some of these comments are pure entertainment...death fog, draining oil and pouring it back in...while its cold enough outside to freeze unprotected skin in a couple of minutes with the windchill and it does feel strange on your lungs (people jog in it all the time), if you dress right its not so bad....although I wouldn't be under my car draining the oil out LOL...handling anything metal without thick mitts and it burns your skin quick.
I have experienced -40C/40F plenty of times. Lowest cold start I can remember was -46C/-50F, all I had was a block heater. Sure the car made some strange noises and didn't drive smooth right away but after a bit everything was fairly normal. Of course the weather only snapped like that for a couple of days at a time before returning to seasonal in my region.
These are a given: Run the 0w20 TGMO/M1, make sure your coolant is freeze protected as low as you can go, make sure you have a block heater, make sure your car is running 100%...then do whatever the locals tell you to do. They live there, they know the tips and tricks for day to day living in that weather.
Here's a fun party trick at -35C/-31F and colder....boil some water in a cup in the microwave...go outside with it still boiling and throw it up in the air....instant snow..its pretty cool.