- Allen keys 10 and 12 mm for filler and drain plugs.
Replacement materials:
- Hypoid oil according to BMW specification: SAE 75W-90.
- Two O-rings made of aluminium, size A22x27.
- Before changing the oil, the final drive housing should be warm to the touch, if necessary, drive for 15 minutes.
- Raise the car in a horizontal position.
Screw out filler plug -1- with an Allen key.
When a small amount of oil comes out of the hole, the oil level is good and the housing is tight. Otherwise, check with your finger to see if the oil reaches the lower edge of the filler hole.
Attention: In the event of a large loss of oil, find the cause and eliminate it.
Unscrew the plug -2- of the drain hole, collect the escaping oil.
Attention: Do not drain oil on the ground!
The drain plug is magnetic to attract metal filings. Wipe the plug from metal filings, then wrap it with a new sealing ring with a torque of 50 Nm.
Fill with oil using a manual oiler.
Oil specification: SAE 75W-90 hypoid gear oil. Only transmission oils approved by BMW must be used (the corresponding inscription must be on the packaging).
Refueling volume: cars of models 520i, 523i, 528i, 535i, 525tds - 1.0 liters; car model 540i - 1.2 liters.
Caution: hypoid oil is viscous, so do not drink too much oil at once. Place a container under the main gear, wait a pause, if necessary add oil to the required level, collect excess oil.
Tighten the filler plug with a new gasket to 50 Nm.