I gotta throw in here: we raced a hemi for 14 yrs, we used what ever brand we could get furnished(very small sponsorship) quacker state-Valvoline-Sunoco. long as you have the appropriate weight for your engine, the right oil pressure and clearances, I don` think it`s worth arguing about. and, as some of you may know most of the refined crude oils come out of the closest refinery to you anyway. they just blend in a different brands additives. one of my uncles used to work in a Sunoco oil blending unit, they did everyones oil(at that time) except phillips 66. now it even comes out of there.