Due to a manufacturing defect, a crack can develop on the fuel filter when the vehicle is operated in high temperatures. This crack can result in a fuel leak, increasing the risk of a fire. Dealers will replace the fuel filter to correct this concern.
Resources for the Repair and Maintenance of your 2012 Mercedes-Benz S550 4MATIC
2012 Mercedes-Benz S550 4MATIC
2012 Mercedes-Benz S550 4MATIC Recalls (Recent)
2012 Mercedes-Benz S550 4MATIC Reviews
09/20/2012 2012 S550 4 Matic. Second time in the shop. 1st problem - the heated steering wheel didn't work from the beginning had to wait for over a month for a new steering wheel to come. 2nd problem - started at around 7k miles and at least once a week it's loosing power at speeds between 60-80 mph and starts shaking. Took it to the dealer. Transmission problem. Now they are waiting for a new transmission and I am driving a very expensive Chevrolet equinox(rental). In addition to the above, the dashboard is making these clicking/cracking noises even when the car is stopped, folding mirror makes squeaky sound when unfolds. For $110K I wasn't expecting a LEGO.
10/15/2012 Update: Waiting on yet another transmission... that's few weeks after they put a rebuilt transmission in that makes a whining noises.