blupupher- cost partially as well as what the warranty company will pay for. I really didn't want to fight with Ford to use my own part on their motor.
Ahh, OK, so not your dime, I can understand that. Even then, the newer OEM parts do address some of the issues, just not quite as well as something like the Melling pump would.
Again, I personally would just use a cheap synthetic 5w-20 and change every 4000 miles or so. It is what I am doing with my BIL truck.
I could understand the desire to use a name brand 5w-30 synthetic though, my brain still thinks that way some times, but regardless, I would lean toward shorter OCI instead of longer (or even recommended).
This is part of the reason I say use a cheap syn oil, regardless of which oil brand or weight is used, 4000 miles is about the limit on these things. the long timing chains, hydraulic adjusters, VCT solenoids, phasers, just a lot of stuff going on in these things that can be hard on oil.