Courtesy of Wemay, I asked this question in the wrong thread and it never went anywhere so I thought I'd ask again. Looking at the voa values, and recognizing there are no 10w30 oils with Dexos approval, my question is why not? Specifacally for the above listed Valvoline Synpower. These values seem almost identical across the board. What other factors make a 10w30 not Dexos adequate?