That is fantastic! I haven’t seen one with that kind of mileage on its original engine. (Except the old power strokes) here that 5.4L doesn’t seem to hold up. And has tons of issues with exhaust manifoldsI run a small construction company. Our superintendents and foremen put a ton of miles on their Ford trucks. It is pretty typical for them to have over 300K before we upgrade them to a newer model. Our '14 F150 "yard truck" (formerly the daily driver of a foreman) had an engine replacement about 50k miles ago. It currently has 411k miles on it, and still drives pretty well. Our General Superintendent has a '16 F150 with 310K on it - zero major issues, looks and drives great.