I did a lot of seaching on the differences, benefits, etc of these 3 Mobil 1 synthetic oils and really can't discern much between the lot of them. The data sheets on the 5w/10w are almost indentical with the 0w looking better on paper than both (somewhat lower low temp Vis and somewhat higher high temp Vis). Other than that, some oil tests have had the 5w thin more than the 10w (don't understand why given the specs) but I see no tests on the 0w; also, some posts have suggested that the 0w is the more 'advanced formualtion'...whatever that means. I don't even see why Mobil 1 has these 3 oils, (except to occupy more shelf space and exactly match OEM recommendations to sell more oil) as the 0w can, on paper, cover it all. So, if these were the only oils in the world, which one would you prefer/use and why? It seems like the 0w would be a no brainer but still most all folks who use a xxw-30 Mobil 1 oil use the 5w-30 or 10w-30.