To me the hardest diesel Mercedes to find in good condition are 300D 2.5's, for some reason they're all beat to hell and overpriced.

I checked out one in horrendous condition.

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1998 Ford Escort ZX2 5 speed - 279,000 miles My Daily

1992 Mercedes 300D 2.5 202,000 - Pure junk
2000 Mercedes E320 Black - 136,000 miles - Needs repair

Don't forget to grease the screw and threads on the spring compressor.