If you want to be precisely accurate the complete engine, including the oil in the engine pipes and engine oil cooler is 9,70 liters. However, and for purposes of knowing how much oil can be changed, short of disassembly of the engine, according to BMW (
https://wbeista.bmw.com) and how much oil can be added at an oil change, the answer I provided is the same as BMW states--oil quantity in sump:8,00 liters, oil in filter element: 0,50 liters, total: 8,50 liters.