Mercedes-Benz W211 722.6 automatic transmission oil and oil capacity
Mercedes-Benz W211: which ATF suits the 722.6 automatic transmission?
The oil container must carry the Mercedes-Benz approval MB 236.10 or MB 236.14. The newer 236.14 also suits the 7-speed transmissions, but it brings no extra benefit in the 5-speed. MB 236.15 is blue, the oil for a different transmission type, and must not be mixed up with 236.14.
Mercedes-Benz W211: what happens if the wrong oil is put in the transmission?
The gear changes may start to jerk or become harsh, or the transmission may slip. If the symptoms begin after an oil change, first check that the container is marked MB 236.10 or 236.14 and that the oil level is correct before suspecting the transmission itself.
Mercedes-Benz W211: how much oil does a 722.6 transmission oil change take?
A drain-only change replaces about 3.5-4.5 litres, because oil is left in the torque converter. A machine flush uses about 10 litres. The filter and gasket are renewed during the change, since flushing does not clean the filter.
Mercedes-Benz W211: how is the automatic transmission oil level checked?
The check is done with the dipstick with the engine running and the transmission oil warm, about 80 °C. A reading taken cold or at the wrong temperature is a common mistake. If you add oil, add a little at a time, for example 0.5 litres, and measure again.