I'm going to pick on Ford and there Motorcraft oil as this is what I run in my 2013 5.0 Mustang (Motorcraft simi-synthetic 5w20) Can I assume that Ford has tested the extreme heck out of the oil with there name on it to a point where they have parted out there engines to see how the wear patterns are after abusive testing? Or did they just pick the lowest oil supplier bidder and go with it?