I live in southeast KY where temps from December through February can drop to 0F and occasionally a few degrees below 0F. The best Ccv I have seen for a dino based 5w20 is 5200@-30 C for Chevron/Havoline. Is that good enough for a vehicle that is never garaged? How does this compare to M1 0w20 that is 5500 at the colder standard of -35C ? I realize this is a bit of a loaded question, just seeking opinions. I definitely want to stay with a 20 weight for warranty issues. I use Castrol GTX 5w20 during warmer times for the year. My vehicle is a 2002 3.0 OHV V6 Ford Ranger. Thanks!