How stringent are the Ford specs? The only one that I'm maintaining is my dad's 06 F150 4wd w/ 4.6, the last one I had was the 300 which literally runs on just about anything in the crankcase. The tiny bit that I do know about Ford is that they use slightly different spec numbers for the different grades.
Not that stringent I would think, some syn blends meet 961-A1. But Pennzoil’s best oil doesn’t. One of life’s great mysteries.