I own a 81 300D with 220,000 and I am casually looking for a good deal. I would like to use my current car as a parts car... should I stay away from any later models then?

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1981 300D 205,000 mi.

I'd say you have maybe 15 to 20% if the mechanical parts that interchange but also in some cases are actually different.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Agreed.

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83 SD

84 CD