MB CD shows full capacity of 7.1 liters and 6.2 liters (6.55 quarts) for a fluid change. Add 4 liters, start the car, leave in park, add fluid until level is 12mm (.47 inch) below min. mark on dipstick, then move shifter through R-N-D-N-R, pausing in each position for a few seconds, return to Park and add more fluid as necessary.