Oil consumption at 156 2.5 V6

Hi, I just checked the oil level and got half a heart attack!!! I went to the workshop of my trust and they once filled up just 2 liters of oil. – What do you know about the oil consumption of the 2.5 V6??? – What would be a normal consumption (does it usually consume at all???) – If that is not normal, what can it be? I need your help!!! Greeting to all infected!