I notice you guys don't seem to be using oil which meets Ford's certifications - 5W-30 which meets Ford M2C913-B or M2C913-C (which succeeds -B).
I'm just wondering why not?
Mobil Super FE 5W-30,
Castrol Magnatec Professional A1 5W-30,
Liqui-Moly LEICHTLAUF SPECIAL 5W-30 and
Nulon Full Synth 5W-30 all meet either the -B or -C certification. Are these oils hard to find in stores, or too expensive? I haven't looked yet but am curious as to why you're using non-certified oils.