AdBlue is also used in the latest Audi ultra TDI engines. It is supposed to be refilled during normal service (every 30000 km), unfortunately it does not last t

AdBlue is also used in the latest Audi ultra TDI engines. It is supposed to be refilled during normal service (every 30000 km), unfortunately it does not last that long and you have to schedule an appointment much earlier. Refilling it yourself is apparently not possible since a software reset is necessary as well.