Unlocking the driver's door (mechanical key)
If the vehicle can no longer be unlocked with the SmartKey, use the mechanical key.
If you use the mechanical key to unlock and open the driver's door, the anti-theft alarm system will be triggered.
Take the mechanical key out of
the SmartKey.
Insert the mechanical key into the
lock of the driver's door as far as it will go.

Turn the mechanical key
counterclockwise to position 1.
The door is unlocked.
Turn the mechanical key back and
remove it.
Insert the mechanical key into the
SmartKey.
See also:
Engine oil viscosity
Viscosity describes the flow characteristics of a fluid. If an engine oil has
a high viscosity, this means that it is thick; a low viscosity means that it is
thin.
Select an engine oil with an SA ...
Cargo & Towing
When properly equipped with the optional trailer hitch, the GLK350 is rated
to tow up to 3,500 pounds. ...
Adjusting the climate mode settings
(AIR FLOW)
This function is only available with automatic
climate control.
The climate control settings are especially
effective at high temperatures.
You can select the following climate control
setting ...
