On Sedan and Coupe models, the spare tire and tools are located in the luggage compartment. Lift the carpet and remove the tool kit and jack. Unscrew the retainer and remove the spare tire from the luggage compartment.
On station wagon models, the spare wheel and tools are located on both sides of the luggage compartment. Open the side trim of the luggage compartment and remove the jack from the right side. Unscrew the retainer and remove the spare wheel and tool kit from the left side of the luggage compartment.
With the vehicle on the ground, loosen the wheel mounting bolts half a turn.
Remove the plug from the threshold and install the jack. Turn the jack handle clockwise to raise the car enough to lift the wheel off the ground.
Completely unscrew the wheel mounting bolts and remove the wheel. Install the spare wheel and secure with bolts, tightening them slightly. Lower the wheel.
Tighten the wheel mounting bolts to the specified torque in a diagonal sequence.
[Publication taken from an online resource: MERCEDESMAN]