I am a person of many automotive loves ( perversions?) and one of those things is I love reliable cheap to operate cars, not just fast ones. Anyhow, I have always had a thing for the 1976-1985 Mercedes Benz W123 Chassis diesel cars like the 240D and 300D. I like the look and the fact that the only thing that seems to kill them in any large numbers is rust. One of the other things that is incredible is the amazing solidity they are built with. Even rusty ones have doors that close with a feeling of solidity that is just incredible. I also drive 40-50k city miles a year and need something reliable and good on gas...err...diesel. I would prefer the 300TD which is the station wagon with the 3 liter 5 cylinder turbo diesel as it would be a good car to use for swap meets and parts chasing in addition to it's intended service as a pizza delivery car. What I am wondering is what kind of fuel mileage do people get from them? How hard is it to add an intercooler? What commonly goes wrong so I know what to look for?