Same viscosity, 0w-20. I have 2 or 3 quarts leftover of 0w-20 AP from my last oil change and I decided to go with M1 EP 0w-20 for my next fill in large part because M1 won't give a rebate on the AP this rebate period. That and the fact when I'm only going to go out to 7,500 miles tops on the OCI (don't want to go against my Yukon's oil life meter at this point at least for warranty reasons,) I'm not even certain the AP is the better oil at those OCI durations. I'd rather use it up if I could as opposed to simply recycling. Curious as to others thoughts/comments.