I've was using Valvoline before I found this site and have used it for a couple OCIs since, but I am switching to Pennzoil next time. The additive pack is a little more robust in the UOA reports that I have read.
I have a UOA posted from a 5k run on Valvoline, wear minimal and it didn't sheer out of grade. However, there didn't appear to be a lot of additive (other than a ton of sodium) either.
I am going to try a couple runs of YB and retest.