See also:

Additives
Do not use any additives in the engine oil. This could damage the engine. ...

Activating/deactivating airrecirculation mode
You can deactivate the flow of fresh air if unpleasant odors are entering the vehicle from outside. The air already inside the vehicle will then be recirculated. WARNING Fogged windows impair ...

Hydroplaning
If water has accumulated to a certain depth on the road surface, there is a danger of hydroplaning occurring, even if: you drive at low speeds. the tires have adequate tread depth. For this ...