Mercedes-Benz W204 automatic transmission oil and oil change
W204 automatic transmission: which ATF oil does it need?
A transmission built after June 2010 (7G-Tronic plus, option code A89) takes the bluish MB 236.15 oil. An earlier transmission takes the red MB 236.14, and the 722.6 transmission also MB 236.10. Red and blue oil must not be mixed. What matters is the manufacturer's approval, not just the label on the oil.
How is the oil level of the W204's automatic transmission checked?
The level is checked with the transmission warm, after cycling through the gears by driving. The correct measuring temperature varies by transmission and by instructions: the sources mention both about 40–45 °C and about 80 °C. A level measured at the wrong temperature gives a wrong result. The engine must be running during filling.
How often is the W204's automatic transmission oil changed and how much oil is needed?
The manufacturer's interval is 125,000 km, but many recommend changing it as early as every 50,000–75,000 km. A normal change takes about 5 litres, a flush change about 12–15 litres. The sources disagree on whether flushing is needed. The filter and the plug body are renewed at the same time.