N63 B40/B44 O 1 only
WARNING: This page does not describe the selected car, but rather 23 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750i, and 2015 BMW 750Li xDrive. However, it is still accessible from the selected car via links, so may be relevant.
Check coolant level when the engine has cooled down. Adjust coolant level to (A) approx.110 mm - 160 mm below the upper edge of the coolant filler neck. Use a tape measure where appropriate.