I'm seriously thinking there is no real difference between Walmart brand Full synthetic or Mobil 1 Full synthetic(or other high-end oil brand), except price maybe... I'm getting ready to do oil changes in both my Denali(tow vehicle) and my BMW(family vehicle) and they both take 5w-30 like my Terminator. In my Terminator I use Motorcraft Synthetic blend because it has low miles and that's what it's had since day one with zero problems. My other cars are high mileage and reading the back of the 5qt jugs they both have the same aprovals and ratings so why should I pay $5 more for each jug if they have the same approval ratings? Anxiously awaiting to hear your thoughts.