This may be common knowledge, but I just recently found out that M-B provided a special pad under the front subframe to use when jacking the car up. It is on the rear cross member section of the subframe (under the steering rack), in the center. It is about 35mm high x 35mm long x 75mm wide and is attached to the crossmember by an expander plug. At the rear I jack under the differential. I put a hockey puck in the saddle of my floor jack to spread the load and prevent slipping. Jack stands can be placed under the rubber pads along the rocker panels.