Lots of diesel engines have injector issues. The 6.0L 2004 model didn't have injector issues. It had high pressure oil pump issues, oil cooler issues, EGR cooler issues and some issues with sticking vanes in the variable geometry turbo due to excessive idling and coking, cracking in the down pipe and restricted turbo oil drain lines. There were other issues but those are the heaviest hitters.
Most of the blown head gaskets on the 6.0L were due to super tuning the engine and increasing turbo boost over 32psi without upgrading the torque to yield head bolts to ARP studs. The bolts would stretch when the EGR cooler gave out, which happened because the 1200 degree EGT going across the EGR would boil out the coolant, which would cause the oil cooler to become ineffective and eventually begin leaking coolant into the oil. Coolant turns to steam and increases pressure, blows head gaskets.
In a nuts .

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