I have a 1986 Ford F250 diesel with about 185k miles on it, and it’s still going strong. We have had some problems with the glow plugs lately though…we seem to be going through glow plugs faster than usual, and they are sort of expensive. We’ve also replaced the injectors recently. Boy, talk about putting up a smoke screen while going up a hill and losing power when those injectors are clogged!!! Sheesh!
But all that stuff is no different than repairs you’d have to do on any older vehicle. The diesels are supposed to last a long time, and I know that for the 1986 models, the transmission they put in them was very heavy duty…strongest you could get. I’m not sure about 1987-up because they changed the truck then.
Is this diesel turbo charged? We ended up putting an aftermarket turbo charger on ours, and it made a world of difference when towing on hills! It cost about $2000 and was well worth the investment.