My 1985 300SD California model is at 282000 miles. I have owned it two months now and have driven it 3000 miles.

It had a transmission "ring gear" replaced in the 90's as well as a new long block from the factory in the 90's (done at a SF dealership for over $8000). I assume that means there is really a lot less than 280k on the engine. I had no idea about that until I dug through the glove box after buying the car.