Originally Posted by kschachn
And to be honest as Blackstone and others have repeatedly noted, within appropriately rated oils the UOA isn't even about the oil. It's about the equipment or operating environment.
Unless something is out of whack with the engine then all that UOA shows is that it is "fine", just as it would be "fine" with another oil.
Agreed. My opinion is that most oils that meet the same specifications are going to perform relatively similarly under a moderate operating environment. It's not until you push things into the extremes where you may start to see a benefit of one oil over another - ex - high temps, extreme cold, excessive fuel etc.
Both results look fine. I'd go with whatever is easier to obtain, whether he cares about actual approvals or whether there is a brand preference. Otherwise its a wash.
The PP is GTL/V based (not sure about the V with Pennzoil though)
Amsoil is PAO/V (10-14% estimated)
GTL is a fantastic base oil IMO. I'd put GTL up there with PAO.