ok so what kind of money would take to find and buy a 1980s MB 300D, black, almost mint, and preffered lower miles but its diesel so itl last forever.... So yes please answer my question.

I'm not sure to be honest. I bought a one-owner, no accidents 1984 300DT with 306000Km (so about 190000 miles) for $3600 (with FSM and full service records). I think I did pretty well, but ymmv?

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1984 300D Turbo, 326000 Km, Thistle Green Metallic

80's 300D, easy to find.
Black, much harder. They don't seem to have sold many black ones.
Almost mint, still harder. The people who bought these cars new usually bought them with the intention of driving a lot. Well maintained examples aren't so rare, but almost mint is going to be rare and $$$.

If you aren't dead set on the black, white and especially yellow ones seem to be all over. Condition is the primary governor of price. Mileage isn't nearly as important. Around here you could find one in good shape and suitable for many miles of service for probably $3-5k. Like new condition is going to command several times that price.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

Have you looked at eBay? I've seen up close the 1984 300D Euro located in Memphis. The guy seems to do good work. I have an interest in seeing the car go to a good home.

Comes with complete service records.

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daw_two
Germantown, TN

Links:
Sold last car --- 05/2012 1984 300D Light Ivory, Red interior
Cluster Needles Paint
New Old Stock (NOS) parts

Past:
3/2008 1986 300SDL "Coda"
04/2010 1965 190D(c) "Ben"
& many more