As I commented earlier I changed the oil in both of my vehicles today and ran with the Castrol Edge 5w30.
1. The V10 is very very quiet now. It's never been that quiet on a fresh change of 5w20. Hopefully my oil consumption will go way down. I bottled a little used oil to send out for a UOA. Regardless of the outcome, I plan to go back to Mobil1, however, I'll be using 5w30 from then on. Provided I get the oil consumption issue taken care of.
2. This oil seems (so far) to be not much different than Castol Syntec 5w30. I say this because the lifters in my old 5.7L LT1 stay far noisier after a cold start than when a fresh fill of Mobil1 5w30 is in the crankcase. I ran Castrol Syntec 5w30 last winter, and when it was cold out, the lifters tap tapped away for far longer than I'd like them to until the oil got up there.
I guess what I'm trying to say is that even though Castrol Edge has some PAO in it, it isn't the same as straight PAO (Mobil1). If it's true that Castrol Edge is 8x better at wear than Mobil1, I'd have to say there's more to a good oil than just protecting when it's warm. Cold start up has just as much to do with an oil being good. And I was hoping that Castrol Edge had licked the cold start up thing. At least for me anyway. I understan that with 180,000 miles on the engine my oil pump my be a bit weak, and the lifters/rockers/pushrods a bit worn/loose. But it is still to me a demonstration of the oil still not perhaps flowing as well as a pure play PAO like Mobil1.
Just my 2 cents,
RustyFuryIII