Maintenance intervals on BMW vehicles are set depending on the operating conditions and are displayed to the driver on the dashboard. At the same time, there are different forms of operational service (Change of oil) and routine maintenance of TO-1 and TO-2 or annual maintenance with a small annual mileage. At the service station, the corresponding indication of oil change or service intervals is reset to zero after maintenance has been carried out. To reset the display, a special expensive key is required, which is sold at BMW service stations. At BMW-licensed workshops, the service interval indicator can be reset free of charge after a self-service service if desired. The interval indicator can also be reset with a homemade key. If the oil is not changed or serviced as indicated by the service interval indicator, the intervals given below should be followed.