It's around 10 degrees today and I can tell my Jeep 4.0 I6 engine is struggling a little at start up with the M1 10w-30. I stopped at Autozone and couldn't find any GC 0W-30, which seems to be the latest rave on this site. They did have 0W-30 in the M1 flavor, so I got it. What are your thoughts on this oil? I need to keep telling myself that it's the same oil, just a lot thinner in extreme cold temps. Wish me luck tonight when the temps probably drop to single digits and I'm laying out in my snow packed driveway with my flashlight, changing my oil.