I don't know how much the engine has, but the odometer has at least 310,000 on it...
I'm pretty sure that neither the odometer nor the engine has ever been rebuilt.
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1990 D-250 Regular Cab: Full power screw; stout TC and A518 w/ manual valve body; ratchet shifter; piston LP; Ramcharger tank; manual off; computer-programmable 40 GPH water/meth fumigation; gauges