Loss of power tapping and knocking in the engine, possibly rocker arms or push rods loose, antifreeze, metal shavings in the oil pan, just things that shouldn't be wrong with it at 52000 miles.
It's a nice truck, but lacks the performance it had.
Sounds like your truck has the same amount of miles on it as mine 110,000kms
I feel for you, I can't drive mine safely so it sits in the carport, where it must sit unless I want it to get wet inside and smell musty for months afterwards. It is a shame that myself being a true loyal Ford driver for years is now going to look into a Honda or Toyota. What is the point in making a truck that people cannot drive without worrying about all the noises and leaks and things? Ford your going to have to improve if you want to stay on top. One main reason I have bought Ford most of my life is because they used to run forever. My 77 F250 4x4 gave me close to 30 years of dependable service, needing another truck to replace that one I bought this one with "low" kms. Now I know why it was cheaper than the rest of the nice looking trucks on the lot that weekend. I am embarrassed that this has come to this, as I did so well and used to brag about how great my last truck from Ford was. It is truly sad, I will go buy a toyota and pay the extra money knowing it is going to be something I can brag about again.