Cold. Stone cold. I've changed it at 20F and didn't think twice--if anything, it was easier to roll around on the ground, all bundled up, yet the ground was nice and solid, no worries about rain etc. My current daily has the oil filter behind the exhaust manifold and it is a burn hazard IMO.
DESPITE doing 10k oil changes I just don't think my new-ish fleet somehow has the equivalent of sandpaper flowing through the oil passageways--the oil is far from done, and it's far from loaded up. And I don't think warming it up will suddenly make it vacuum up any deposits that had dropped overnight into the pan.
Now, if I was running 15W40 and needed to do an oil change at 10F, then yeah, running for a bit so as to get it thin so it'll flow in decent time, ok I'd do that. And old school differentials, with gear oil, that is best done warm, no doubt about that.
Your mileage will very likely vary here.
DESPITE doing 10k oil changes I just don't think my new-ish fleet somehow has the equivalent of sandpaper flowing through the oil passageways--the oil is far from done, and it's far from loaded up. And I don't think warming it up will suddenly make it vacuum up any deposits that had dropped overnight into the pan.
Now, if I was running 15W40 and needed to do an oil change at 10F, then yeah, running for a bit so as to get it thin so it'll flow in decent time, ok I'd do that. And old school differentials, with gear oil, that is best done warm, no doubt about that.
Your mileage will very likely vary here.