I am curious if anyone in colder climates use 0w30 or even 0w20 in the dead of winter to help cold start engine wear.
I doubt I qualify for the climate you are asking about. PA has it's own kind of cold with the humidity but it doesn't typically have the lower temperatures of further north.
I run the stock 5W-30 spec but I also have a block heater, oil pan heater, and battery blanket because I'm a mechanic in the military. Cold weather makes make me hurt. The block heater and oil pan heater make a world of difference in the length of time the engine takes to warms up. Now, the hole in my system is it works when I'm home but if I'm elsewhere, I don't benefit from it since I don't have a place to plug in.
Blackstone testing has shown that wear has been good with no concerning numbers in the 2011, 2019, and previous vehicles I've owned. Granted, I run full synthetic over pure petroleum or synthetic blend oil. So, that makes a bit of a difference.