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i have used Mobil 1 full sythetic on my 07 expedition since the second oil change.
Follow the same guidelines that the ford manual states for the motorcraft synthetic blend. I am pretty sure it takes 6 qts but it might be 7, can't quite remember, its been a month since I changed it last.
I talked with my service writer and he stated that he has seen no difference. It is more what you want in the motor. Ford does not seem to care if you want full or blended both are good.