Section 204 (On-Vehicle Servicing - GA6HP26Z): Lubrication: Notes
WARNING: This page does not describe the selected car, but rather 20 other vehicles, including the 2006 BMW X5, 2005 BMW X5, 2005 BMW 760i, 2005 BMW 760Li, and 2005 BMW 745i. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Transmission is sealed at factory for life of transmission. If any leaks are found, factory recommends replacing transmission assembly.