I am well past 500k with my 'old blue' 93. Repairs to date are numerous but nothing that was a killer. Water pump at about 350k. One fan clutch, four times reshiming the getrag, ORIGINAL CLUTCH, one differential overhaul, lots of ujoints, couple of brake jobs front and rear, rotors on the front, wheel bearings all around, two light switches (need one now), head lamps, pot joint on the steering, booster and master cylinder, heater core (what a bi-tch that was), brushes in the alternator, ORIGINAL STARTER, nothing on the turbo and nothing in the engine. Different seats, hood latch cable and e brake cable and needs a headliner and windshield.
Cranks instantly and I would drive it anywhere.
Total accumulated miles for me behind a Cummins is over a million.
James
Edit: Oh I forgot to answer what type use. Mostly highway, long trips delivering equipment that we build.