The volume of the tank on your Series 5 Touring is 12L.
Below 1500 miles of remaining mileage, an AdBlue® warning is displayed on the dashboard and a sound can be heard to indicate to you to fill up. Under 650 miles of mileage, an AdBlue® warning is displayed on the dashboard along with a sound. A message warns you that the car will not start once the tank is empty. Once the tank is empty, a message is displayed and 3 alarm signals sound. Once the engine is turned off, it can't be started again.
If your tank is completely empty, once stopped, you cannot start the engine again. If your engine is still running, you are able to drive to a service station to proceed to the replenishment of your AdBlue® tank.
This information can vary on some vehicles of the same model in relation to the options chosen by the manufacturer.