One thing that has really struck me about the Conoco/Motorcraft 5w20 is the excellent UOAs this oil continues to post in a wide variety of engines and driving conditions. And yet when we look at what UOAs and VOAs tell us about this oil, it seems to be quite unremarkable in terms of the additives—at least the ones that are revealed by the typical oil analysis. Most other 5w20s show high levels of moly and boron, and overbase or near overbase levels of calcium. From what we know of these additives it's reasonable to expect good wear numbers from such oils. But the Conoco/Motorcraft 5w20 shows none of these additives, relatively normal levels of calcium, and near GF-4 levels of ZDDP. How, then, is this oil able to delivers such outstanding wear numbers? What could be in it that isn't showing up in the UOAs and VOAs? Antimony, as in Schaeffers? What do you think? Let's speculate with some educated guesses.