Be sure to double check the odometer. My 1970 220D only has five digits, and has lower milages than yours if you don't count the missing leading two. On top of that, older Benz's have a history of odometer malfunctions after 200,000 mi.

Look underneath at the bracket holding the parking brake cable where it meets the great outdoors. Beat up and rusty might mean you're missing a leading digit on the odometer. Thump the body around the wheels - the second place for rust to show up.

Fuel sender not a big deal. Kind of a sliding cylinder type, which can clog with dirty fuel. Empty tank through bottom plug, refill with clean and biocide, drive on a bumpy road. If not working on second tank then bump the sender with the end of a long siphon hose worked in through the fill cap.

Mine has manual everything except brakes. If manual windows, check for slop in the drivers door regulator- like moving the crank an inch before the window moves. If that's tight and the clock works then you may have a gem and the $4000 NADA might be worth it only if you're in love and you accept a 65 mph car that accelerates slightly better than a semi-truck, and you're willing to do the maintenance (sic) since modern mechanics aren't well practiced with old style oil filters and adjusting valves. $3000 is more like it for a good 220D, less if any doubts.

The all manual 220D and 240D (non-turbo) are probably the world's most reliable and long-lasting automobiles, providing the maintenance is done correctly and the car is kept out of salt. 500,000 mi is an expectation, not a pipe dream.

daBenz