00 11... Checking/Topping Up Oil Level In Rear Differential

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).
Oil filler plug with O-ring:
Replace oil filler plug (2).

Tighten to specified torque. See REAR AXLE -- TORQUE SPECIFICATIONS .

Fig 2: Identifying Oil Filler Plug With Sealing Ring And Oil Filler Plug With O-Ring

Courtesy of BMW OF NORTH AMERICA, INC.