Topping up transmission oil after a repair
WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
Stand vehicle on a level surface and secure against rolling off.
Undo oil filler plug (1).