Im not sure what topic to put this under but I have a 2011 6.2 Silverado with only 16,000 that I just purchased and use for daily driving, and some hauling, I also travel mountais regularly as I live in a valley, and we do have some cold temps in winter time Pennsylvania. I'm trying to decide between the new formula M1 0W40 , Shaffer's 9000 (9003D) 5w30 dexos-1 oil, and they also have a advanced European formula 5w30 8007 full saps and 8008 mid saps. One other thought is my wifes 2014 jeep grand Cherokee with the 3.6 penstar that takes 5w30 or 5w20. Is there something that would be verstal for both and still be good for the truck
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