i own 2 olds diesels and they both get 25 mpg and have over 200,000. The first diesel that came out had problems but in 1984 they had all the problems worked out but the injection pump diapham. If the diersel you are buying is running i'll bet its been replaced.I have had both diesel cars since about 45,000 and they have been great cars for me. Both of them start good and have plenty of power for diesels.