I'm planning on buying my first car soon, and I'll be getting either a Chevy G20, or a Ford E350 diesel. I saw 2 decent chevy ads which I am considering, but I also founds 2 E350 diesels for sale. 1 is a 1995, 7.3L auto, 190K miles, for $1900, no other information. Another is a 1994 with "high mileage" (no number listed) for $1500, also saying "runs good," if that even means anything. 190K miles on a gasoline engine would have me worried, but I've been told that diesels will easily last until 250K miles. What can I honestly expect out of a 7.3L diesel E350 ?