Stop in for a cup of coffee

Rainy Day Auto said
the coldest I have ever seen it is -20 which is what it was this morning when I went to work at 5 a.m.

I use 5-20W ...at least that is what is in it now .....it was the cheapest bid a few months ago lol

Well using 5w20 with Lucas is probably fine at -20. 5wXX is good to -35 with Lucas, it's probably -25 or so. The Lucas will help coat the running surfaces as extra protection until the oil really starts flowing.