See also:

Automatic locking feature
The vehicle locks automatically when the ignition is switched on and the wheels of the vehicle are turning at a speed of more than 9 mph (15 km/h). You could therefore be locked out when: the v ...

Utility
With all that power under the M-Class' hood, along with its sporty nature and comfortable cabin, it's easy to forget this is still an SUV. That means the M-Class better do a good job of hauling th ...

Checking the coolant level
Only check the coolant level when the vehicle is on a level surface and the engine has cooled down. Turn the SmartKey to position 2 in the ignition lock. On vehicles with KEYLESS-GO, press the ...