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27 00... Topping up transfer box oil (ATC 35L)

WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Use only the APPROVED OIL in the transfer box.
Failure to comply with this requirement will result in serious damage to the transfer box!

Necessary preliminary tasks: 

Check/adjust transfer box oil level: 

Undo oil filler plug (1).

Check transfer box oil level. Transmission oil must flow/drip gently out of the oil filler opening.

If necessary, pour in transmission oil up to lower edge of oil filler opening (1).

Installation note: 

Replace oil filler plug (1).

Tightening torque 27 10 2AZ .

Fig 1: Identifying Oil Filler Plug
G06854446Courtesy of BMW OF NORTH AMERICA, INC.