See also:

General information
The engine oil consumption is dependent on the driving style and driving conditions. Therefore, regularly check the engine oil level after refueling. ...

Malfunction
A message is displayed in the instrument cluster. HDC is not available, e.g., due to elevated brake temperatures. ...

Adding engine oil
Filler neck Only replenish the maximum oil amount of 1 US quart/liter if the message is displayed in the instrument cluster or the oil level has dropped to just at the lower mark of the dipst ...