I see alot of them with bad transmissions as well as ones with worn out engines. Pretty easy to tell both on the test drive.

Also not a bad idea to check the front hub for play. I've seen a few with front spindle/bearing issues.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!