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I have never owned a diesel, but the last 2 1500 Z71's I had were still going strong at 200,000. The seats were starting to wear out though. i had to replace the alternator on both but other than that, there wasn't really anything I had to do to the motor or transmission.

There is kinda a catch to a high mileage truck, you can get 500,000 out of most modern motors, its the stuff the motor runs that wears out. Such as axles, wheels bearings, transmission, ect. a mechanic for GM told me that, I drove my last Dodge till the tires fell off (wheel bearing burned out) replaced it and put another 50, 000 before trading it in.

My old chevy is only showing 196000 but the odometer quit working about 10 years ago!

Mine is a '99 GMC 2500 4x4 (gas)...225,000. Been putting off an A/C overhaul for about 2 yrs...refill with refrigerant every summer and keep on rollin. I'm shooting for 300,000+. So far, no major mechanical issues...

2000 GMC Sierra 357000 miles same engine and tranny. I pull a 32 ft 5th wheel and a boat behind it. I service my engine oil every 3000 miles and transmission every 50 k.

Is it 4 x 4 and what motor? That is awesome by the way.

my buddy had a mid 90's 3500 chevy diesel that rolled a million miles while i was in it one day, general maintenance and a few small repairs but original motor and tranny, he sold it the month after hurricane katrina and a guy used it to pull campers. I think if something is taken care of it will go alot longer than the average person in today's society is normally willing to drive one.

160K on F150 4x4 and still going. I am going to keep this one till it falls apart.