Draining coolant
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2016 BMW 760Li, 2015 BMW 760Li, 2014 BMW 760Li, 2013 BMW 760Li, and 2012 BMW 760Li. However, it is still accessible from the selected car via links, so may be relevant.
Loosen the sealing cap at the coolant filler neck.
Installation note:
Close the sealing cap (1) until the arrows line up.
Unlock and detach coolant hose (1) from radiator.
Drain, catch and dispose of coolant.