My truck has now 504000Mi. Not totally trouble free but what was expected..
Items replaced due to wear,
Hipressuer oil pump
4 Water Pumps
The Valve covers have never been taken off..I still have the OEM Injectors and harness, the Transmission has never been replaced or rebuilt. the rear end is also all OEM.
I owe the the service of the injectors to stanadyne fuel cond.(performance formula)
I get 19/20mpg in my metroplex travels at work. This is one fine Truck..