Date registered: Aug 2009
Vehicle: '72 250C, '74 280C, '85 500SEL, '81 300CD.
Location: Tucson, Az.
Mentioned: 3 Post(s)
Quoted: 59 Post(s)
Check and keep the drains clear! They are located in the bottom rocker panels, in the seam where the rear quarter panel adjoins with the rockers, inside the trunk (hidden behind the pasteboard inserts), in the front wheel wells at the bottom, under the battery tray and under the mesh ventilation screen in the front of the car (accessible through the round vent tubes in the firewall).
Check the mounting area of the steering gearbox for cracking. The '70's models were prone to this. Easy fix if you catch it BEFORE the frame area cracks.