Not knowing where you reside, or are shopping; I wouldn't buy a Mercedes-Benz used, located anywhere above the Mason-Dixon line.

These are not immune to rusting - and boy do the ones up north rust and corrode as they age. Mine has been garaged it's entire life in Dallas, Texas since I bought it new - it is in almost perfect untouched-up condition - interior perfect - exterior - not one door nick - front seats covered with canvas fitted covers since day one - a true southern creampuff - and if I were to sell it, I would ask $10K firm for mine if someone wanted to buy it. Which is somewhat above KBB.com (Kelley Blue Book) that's how I see mine anyway.

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'06 E320 CDI
'17 Corvette Stingray Vert