You're searching for a good car. However, most fellas on this forum love their 300DTs, so they probably won't part with them! There are a few nice examples on Fleabay. It all depends upon how much you're willing to spend.

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Ed
-1984 Mercedes 190D 2.2 5-speed gray market(bought@30,000 miles) (Sold back to original owner@170,000 miles)
-1999 Mercedes E300DT (245,000 miles)
-1999 Mercedes S500 Grand Edition (80,000 miles)