Ask to spin it over and see how it sounds. Does it sound like it even wants to hit? Any loud knocking/out of place noises? After trying to start it a bit, remove the fuel cap and see if you hear a vaccum. I bought a 240D once that would not start. Turns out it was just a clogged tank vent and got the car for next than nothing.

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85 300CD
83 300TD
78 240D (daughter)