TomB985,
I sometimes have to chuckle reading some of the comments here.
We're talking ppm here and everyone is implying that this abrasive slurry will be the death of your engine. lol
Of course the FF will have high numbers, and of course the fuel from this DI Ecoboost monster has thinned (as opposed to mechanically sheared) the oil from the original 8.7Cst.
But as dnewton3 is trying to figure out, does running the oil down to 0% on the IOLM really hurt anything in these tough engines?
Other than BITOGers, will anyone else with the Ecoboost change their oil early? I doubt it.
Now, honestly if we were talking about a DI GM engine such as the 3.6L V-6 with the now infamous timing chain issues, I would be more concerned, not from the relatively high break-in wear, but with changing the oil sooner due to lower viscosity, but these engines seem not to be affected by sub 8cst hot viscosity. I'd only be concerned and reduce the drain interval if it was sub 7cst, but that's just me, seeing that Ford (and Honda) have been using 5W-20 oil longer than anyone else and have it perfected, DI or not.
And the debate will surely continue whether draining the FF early and gradually increasing the oil change interval really makes a difference in engine wear and longevity. I think Ford considered that one too. Now they don't actually insist leaving the FF in for a full length OCI like Honda does, so it probably doesn't matter either way here.
I say, carry on, keep with the Motorcraft Syn-Blend, use the IOLM, and enjoy your truck!
Gary