i have done nothing other than change oil and filters on my powerstrokes. One or two cam position sensors but they were a paid for recall
My idi i have done injectors, pump, return lines and cups twice, fuel pump, fuel lines, vacume pump(not really engine fault) complete GP system swithched to 7.3 system , various oil leaks and i am sure there is more things i cant think of.
That is why i am putting a powerstroke in my 86 on top of the complete lack of power.But like i said, every truck is different
Just guessing but from the 500,000 between all trucks that the PSDs don't have much over 100,000 or the IDI for that matter?