I would inquire about: Glow Plugs (smooth quick cold starts - no loud knocking) Motor Mounts (should be ok at 31k), Miles/Gallon - Should be capable of easily 30mpg + on highway, May need a fuel filter (although manual recommends 50-60k replacement I think) Interior wise ; Make sure keyfob operates from any angle of car ( my older E300 lost it's radio unlock capability and only infra red sensors in door handles would open) , Check to see if the pushbutton climate control goes to full fan speed on it's own. I've seen them where even at LO temp setting with 90+ degrees outside, it won't engage the fan at max speed (that's a warranty replacement of pushbutton panel) And of course, the driver's seat - might pop or crack in quick stops or quick turns. (that's new rail kit)

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Barker