High oil consumption of A3 8P 2.0 TDI

Hello all, I have an Audi A3 8P 2.0 TDI. It has now 23000km on it and I have now already filled in the 17000km in which I have the car 8 liters 0W-30 longlife oil. Is the oil consumption normal?? My friend has meant it is usual to consume the VW Audi engines at approx. 1000km 1 liters of oil. Greetings from the Black Forest