That GM350 Diesel couldn't be driven like a "regular" gasoline car. Which most where.
It had zero tolerance for gradual acceleration... err well minimal pushing of the pedal.
Push it to the MAT and then let up when you get to your speed. I got quite a bit more than 35K most grandpas got out of it. Infact add 100K to that. I got one of the early "D" blocks. a 1981 Olds Cutlass Supreme.
Diesel motors need hard work to live long lives. Other wise they build up crap all the time and basically cake themselves to death.
The only reason it stopped working @ 130K was I forgot to plug it in one cold winter night (I worked long swing) I used ether on it to get it started... Bent the crank a tiny bit. Eventually and it shook itself to death by bending a rod and cracking it off... oops. But that only took seven months.
Those blocks are highly sought by racers, because of the extra nickel and beefy webs. They can be converted back to gasoline... High compression and a big lumpy cam.