Ive read about the plug well filling with oil. Probably on here but ive read so much idk. Something dealing with a gasket around each well between the valve cover and head. Apparently ford's are notorious for those going bad, although im on my 4th ford and havent had that issue. Two where diesels though and the other being that POS 6.9 v10.
I hate to say it but as one of you joked in another thread of mine, i really am starting to think this mill was built on a friday, after lunch. Lol