I also live in Manitoba, near Seven Sisters Falls. It got down to -40C last night (That's -40F)!

My husband and I drove our 05 SE V8 4Runner home last friday evening and the temperature registered between -28 and -30C (approx -20F). The 4Runner (we call her Suvi) drove great and the heating system kept us toasty warm-- so warm that I had to turn it down.

I did notice a few rattles and creaks that I normally do not hear and believe that Suvi was "suffering" a bit from the bitter cold.

My husband grew up in northern Alberta and was taught that it is not a good idea to drive a car when it is below -35 or -40 (Fahrenheit or Celsius) as steel can become brittle at such temperatures. So, in the winter we stay home when it's that cold and avoid driving at night and very early in the morning when temperatures are at their lowest.