See also:

Applying
The lever automatically engages after being pulled up. ...

Automatic deactivation during forward travel
The system switches off when a certain driving distance or speed is exceeded. Switch the system back on if necessary. ...

BMW X5 xDrive35i: BMW's Turbocharged Inline-6 with Valvetronic.
BMW X5 xDrive 35i receives a brand new inline-6 gasoline engine, internally dubbed "N55." The new engine features the same 3.0-liter displacement and 300 horsepower output of its predece ...