One of my old bosses had a 1978 Caddy Seville (the one with the back end chopped off at a slant!)-that had a 5.7 Olds diesel and a TH200 tranny!..what a "pile" that thing was!..but he loved it,he got it from a local Chevy dealer that owed him quite a bit for parts they bought one year and he decided to accept the car as payment,it was a trade in,only 5 years old with about 42K on it...
He knew the diesels were considerd "junk" shortly after they were introduced,but figured it would last long enough to be worth taking,and he could always put a 350 gas olds motor right in if the diesel blew---he gave it to his wife ,but he ended up using more than her--he said he'd get 25 mpg on trips and liked the fact diesel fuel cost less than gas back then...the TH200 croaked 3 times in 20K miles,but the motor hung tough and never gave trouble,but he was anal about keeping the filters and oil changed often,he put a Raycor fuel filter on it...only "trouble" he had with it really was getting it started in frigid cold weather,the glow plugs were always failing or wouldn't energize half the time...