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27 00 270 Change Transfer Box Oil (ATC 35L)

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Special tools required: 

IMPORTANT: Use only the approved transmission oil in the transfer box .
Failure to comply with this requirement will result in serious damage to the transfer box!
NOTE: Only change oil when transfer box is at normal operating temperature.

Necessary preliminary tasks: 

Place oil collecting apparatus underneath.

Drain and dispose of the transmission oil using the transmission breather (2).

NOTE: Do not drain transmission oil through the oil filler plug because complete emptying cannot be guaranteed using the oil filler plug!
Fig 1: Transmission Breather Of Transfer Box
G09877014Courtesy of BMW OF NORTH AMERICA, INC.

Install TRANSFER BOX .

Undo oil filler plug (1).

Tightening torque: 27 10 2AZ .

Use special tool 00 2 080 to top the transmission oil up to the lower edge of the filler screw opening.

Installation note: 

Renew oil filler plug with O-ring.

Fig 2: Special Tool (00 2 080)
G09877015Courtesy of BMW OF NORTH AMERICA, INC.