Hi guys, I have been lurking this board for a long time but haven't posted too much. Hi Patman, I know you from Camaroz28.com, I have the same name there too. Now to business. I've noticed something about UOA's--they really don't account for the quality of the base stock, do they? I mean, they really don't tell us much about that. And for a lot of synthetic oils, that seems to be the most important thing. For istance, don't Amsoil and Redline supposedly use superior base stocks to say, Mobil 1? I really don't understand all the different ways it can be measured yet, but isn't looking at the additive package and what's left of it kind of secondary to wear metals and the physical properties of the base stocks? And there's not much beside TBN that (to me) seems to inform us about them. Anyway, could someone enlighten/flame me regarding my ignorance?