Necessary preliminary tasks:
IMPORTANT: Before beginning repair work, fully press the brake pedal several times to reduce the vacuum pressure in the brake servo.
Pull non-return valve (1) in direction of arrow out of brake booster.
Installation note: Check seal in brake booster and replace if necessary.
Disconnect snap fastener (1) and feed out vacuum line (2).
Installation note: Make sure that snap fastener (1) is correctly engaged.
BMW X3 Service & Repair Manual > Operating fluids as of 11/2015: Final-drive gear oils for bmw m1 motorsport coup
In the BMW M1, the final drive is integrated into the manual transmission and is lubricated by the same oil.
The following oil specifications apply:
During the breaking-in phase or after replacing the final drive (the first 1, 000 km (approx. 620 miles), use of
the following oils is approved: ...