BMW 650i F06 Oil consumption normal?

Hi there, I’m fresh in this forum and I have a question about the oil consumption of my 6s. I’ve been driving the car for about 6 months and it’s my first car in this class and with this engineization, so I’m a bit unsure.Short information about the vehicle: BMW 650i F06 BJ 06/2017 approx. 16.0 l / 100 km. Vehicle is always warm and also “cold”. About 3 months ago I was told that the oil level was low and I should refill 2 liters of oil. Said – done and 2 liters refilled. Well, after about 3 months and 2,500 km more on the clock I was told the same message again and I should refill 2 liters of oil. Is this normal with a V8 biturbo after 2,500 km in the city traffic or do I have to worry about it? The engine runs calmly and e There are no eye-catching smoke patterns from the exhaust. In addition, the vehicle was checked before the purchase at BMW and DEKRA and they had nothing to complain about. Look forward to answers and reviews!