Tips for Checking the Oil Level in 5-Speed Automatic Transmissions (722.6) from Mercedes-Benz


The oil level in the automatic transmission should be checked after an oil change or if a leak is suspected. The problem with 5-speed automatic transmissions (722.6) from Mercedes-Benz: no oil dipstick for the transmission is supplied during manufacturing.

Things to Consider

Oil dipsticks provided by replacement part suppliers like febi offer a remedy for this. However, there are a variety of things to consider:

  • The vehicle must be positioned horizontally on its wheels.
  • The filling tube is located in the engine compartment.
  • The end cap of the filling tube is safeguarded against accidental opening. Before measurement, the plate of the locking pin must be broken off with a proper tool (Fig. 1).
  • The locking pin can now be removed and the end cap loosened.
  • When filling with oil, make sure that approx. 5 liters are initially poured in during the oil change before starting the engine. The engine should be started and run for a short time while parked (in gear “P”).
  • Thereafter briefly shift through the gears several times while idling. Afterwards, shift back to the park position (gear “P”).
  • The gear oil level during a cold state has to be between the minimum and maximum measuring range of 25 ºC (see Fig. 2). If necessary, the oil level should be corrected and measured again.
  • When refilling, the remaining oil should be poured in.
  • ATTENTION: While checking the oil level, the dipstick must be inserted into the filling tube all the way to the end point. Since the 5-speed automatic transmission is used in various Mercedes-Benz models, the filling tube has different lengths. Therefore it is possible that a portion of the rod sticks out of the tube even though the bottom of the transmission has already been reached.
  • The dipstick must be removed after measuring the oil level. The sealing cap can be secured with a new locking pin (also available from many replacement part suppliers).
Fig. 1: Construction of the locking device of the end cap
Fig. 2: Split measuring ranges of the oil dipstick