The extreme that I was talking about was operating at 30, 40, even 50+ below. That's a very strange, nasty world for airplanes to function in, and it involves a whole lot more than engines. Nothing functions right when it's that cold and you have to tread real lightly to keep from breaking things.

The everyday story is milder temps with inadequate pre-heats where you don't get oil starvation engine failures, but instead get incredible wear on the moving parts until you get temps up and oil flowing as it should. That shit won't kill you dead with the engine quitting at 300 ft AGL, but it will certainly shorten the life of that expensive engine(s) sitting in front of your airplane.

Gump

my polaris rep alaska buddy doesn't have a hangar, and if he has to fly
the next a.m., he usually drains the damn warm oil and stores it at 60 deg
and dumps it back in the next day...what fun...!

that much work, might as well go snowmobiling....