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

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

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: 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: Oil Filler Plug With Sealing Ring

Courtesy of BMW OF NORTH AMERICA, INC.