00 11... Checking/topping up oil level in rear differential

WARNING: This page is about a different car, the 2009 BMW 550i and 2008 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Risk of damage!
To avoid serious damage to the rear differential, it is essential to use only approved gear oils in the differential. See REAR AXLE - OPERATING FLUIDS .

Undo oil filler plug (1).

Check oil level.

If necessary, pour in rear differential oil up to lower edge of opening for oil filler plug (1).

Fig 1: Identifying Oil Filler Plug

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Oil filler plug with sealing ring:
Replace sealing ring (1).

Tightening torque: 33 11 3AZ . See 33 11 REAR DIFFERENTIAL CASE WITH COVER .
Oil filler plug with O-ring:
Replace oil filler plug (2).

Tightening torque: 33 11 9AZ . See 33 11 REAR DIFFERENTIAL CASE WITH COVER .

Fig 2: Identifying Oil Filler Plug And Sealing Ring
Courtesy of BMW OF NORTH AMERICA, INC.