I see a lot of people like Havoline oil. I was wondering if everyone was referring to Havoline synthetic or dino Havoline? Also I see they have a high mileage oil; there are a lot of companies that are advertising Hi-Mileage oils. I had used Quaker State HM for some time in my Grand Cherokee that had 218,00 miles (Figured that qualified as High Mileage) Then they started adding Slick 50 and maybe I have been given bad info but I have never really heard anything good said about slick 50, so I stopped using it. I now use Havoline dino. Is the High Mileage oil just playing to our emotional side to always use the best available?