RE: -20c (-4f) revo breakin?
If that 3.3 is anything like the 2.5 to get started in the cold, for the very first start I would start it in the warmth of the house. We had so much trouble getting 3 S-maxx to start for the first time in cold weather. I think it was in the 30s when we did ours 2 yrs ago. Good luck.