For the 6.0 diesel: Ford has an "O" ring upgrade kit for the known issue with stand pipe pressure leaks.
Google: Ford 6.0 standpipe
Also, carrying a spare Turbo Hose and Clamp will be a good idea. The turbo hose gets oily after time and slips off. When it happens, the hose clamp comes loose and falls out of the engine compartment.
Google: Ford 6.0 turbo hose
Any used Ford 6.0 should have had the FICM (Fuel Injector Control Module) replaced by now. Check to make sure.
Google: Ford 6.0 ficm hard start
There are many issues with that engine and it is just a matter of time before they manifest themselves.