Logic check:

If I'm reading this right, this is a cop-out from Ford.

Fuel never touches the spool valve. Only oil. That would indicate either poor oil quality, or improperly extended oil change intervals.

Nothing whatsoever to do with fuel.

I think Ford is trying to point the finger of blame at the folks who are running WVO (even filtered), or VO, or anything other than 100% petro fuel. Despite the fact that there is a significant difference between straight WVO, and fuel bought at a Pilot Truck Stop, that has a B10 sticker on the pump.

-blaine