I have 41 quarts or OPE oil on hand -
I usually buy it when it is on sale - so I save a few $$ and I have a variety so I can pick the grade that best matches the need.
If it is below freezing I use 5W30 that I keep on hand for my Tahoe.
You feel good using a 0W40 when it is below zero outside?
I would rather have 0w30 -
My view may be bias

because I am in Houston and the coldest I can recall in the 36+ years I have been here is 13 degrees.
Typically we get a few days under 30, but rare for me to see low 20 degree.
I am more concerned with it being close to 100 and running for hours and hours straight -