When can I activate the differential lock so that this does not possibly damage the motor vehicle?

The selected combination is correct because activating the differential lock while the vehicle is stationary or driving at walking speed is safe for the vehicle. When stationary, there is no load on the drivetrain, and activating the differential lock can help with traction issues when needed. At walking speed, the vehicle is moving slowly enough that engaging the lock does not put excessive strain on the drivetrain components.

However, it is important not to activate the differential lock when the vehicle is understeering in a bend. This is because the differential lock can cause the wheels to turn at the same speed, reducing maneuverability and potentially leading to loss of control. In Germany, adhering to these practices helps ensure safety and vehicle longevity. Always consult your vehicle manual and traffic rules for specific guidelines related to differential lock usage.