I actually just got done from running my truck in about 0 degree weather. Trust me, when it's really cold temps like you all are talking about, your patience decreases a lot. When you lose your patience, you lose your train of thought to do things thoroughly. Then, something bad happens. I know it's hard to wait, it really is, but if I were you; I would just wait until it was a little warmer out just so that you don't wreck a brand new engine. That's just my $0.02 though.