I had a 2010 F450 King Ranch before I bought the truck in my sig. The chronic radiator leak problems of the 2008-2010 Super Duty’s were most prevalent in the 08’s and 09’s, and pretty much fixed in the 2010’s.
I really liked my truck a lot, but I learned to hate that engine. DPF cleaning (Regen) frequency was erratic and unpredictable. Quite often it would regen as much as every 75 miles, which would kill the fuel mileage, and dilute the oil with fuel. I changed my own oil and always drained at least a quart more oil out than I put in. It never went more than about 200 miles between regens even on its best day.
Unless you’re buying one to delete all the pollution junk off of, I wouldn’t mess with the 6.4. The ask on this truck is too much to be buying for that, because you’ll spend another $10K on it at least.
:):)