Our '88 6.2 Diesel Chevy Conversion Van I elected to rebuild at 189000mi since it burned a couple quarts between changes otherwise took us to east and west coasts on many occasions. I added a turbo from a "98 Chevy Van and wow what a wake up for this motor.

Transmission failed several months later with only a blown nylon seal inside. The mechanic remarked how little wear were on the bearings in the motor and on the clutches in the transmission. The numbers were readable on the surfaces of the clutches.
The full size van accelerates effortlessly and my wife's mileage with our 6 children around town is at 17mpg. The range on this vehicle is terrific.

I owned 2 Olds diesels up to 167000mi and 186000mi respectively. The "82 I replaced head gaskets 3 times the other '83 ran with no problems till I sold it. I also owned an '84 Cadillac Fleetwood diesel and sold it with no problems at 189000mi. It was rare, beautiful and extremely comfortable long range driver.

I hope I didn't get to carried away in our forum with this dissertation on GM diesels

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'96 C220 138,000mi, '95 E300D 239,000 mi., '87 300TD 214,000mi '88 6.2 Turbo Diesel Chevy Conversion Van 253,000 mi.