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Draining & Refilling

NOTE: Numbers in text refer to numbers in figures.
  1. Raise and support front of vehicle. Remove both front wheels. Remove underbody protective plate. Use four screws (2) and washers to hold both front brake discs (1) in position. Apply foot brake and firmly tighten screws (2) to 44 ft. lbs. (60 N.m). See Fig 1. Move selector lever to position "P". Raise and support entire vehicle.
    Fig 1: Holding Front Brake Discs In Position
    G00317005Courtesy of BMW OF NORTH AMERICA, INC.
  2. There are three filler/drain screw plugs on the CVT gearbox casing:
    • To drain the transmission fluid (bottom)
    • To correct the oil level (side)
    • To pour in the transmission fluid (top, for assembly)
    Fill transmission fluid through hole at side. The filler screw plug at the top of the gearbox is provided for other purposes. Remove drain plug (1) from oil sump. See Fig 2. After releasing screw plug (1), excess transmission fluid will flow out of the correction hole. Undo screw plug (1). See Fig 3.
    Fig 2: Removing Drain Plug From Oil Sump
    G00317006Courtesy of BMW OF NORTH AMERICA, INC.
    Fig 3: Releasing Screw Plug & Undoing Screw Plug
    G00317007Courtesy of BMW OF NORTH AMERICA, INC.
  3. Screw in drain plug. Using Special Tool (24 81 00), pump 4.5L of oil via correction hole into gearbox. See Fig 4. Close valve of hydraulic unit so that no oil can flow in any direction. Lower vehicle sufficiently so that gearbox can be shifted into "D".
    Fig 4: Pumping Oil Into Gearbox
    G00317008Courtesy of BMW OF NORTH AMERICA, INC.
    CAUTION: Use particular care while carrying out the following jobs. Make sure there is sufficient space between the driven brake discs and floor as it is necessary to shift through all drive stages. Switch off traction control before shifting selector lever (depending on version). Make sure the hand brake is firmly applied. Connect exhaust gas extractor.
  4. Apply foot brake. Start engine. Run engine for 10 seconds. Move selector lever out of position "P".
    NOTE: Air can be heard to circulate in the system during initial operation. This is a normal operating noise.
  5. Shift through all drive stages, allowing the selector lever to remain in each position for 5 seconds Move selector lever to position "D". Release foot brake. It is sufficient to lightly press the accelerator pedal (engine speed less than 2500 RPM) in order to shift through all gear ratios of the transmission. Leave transmission in 6th gear for about 3 seconds. Repeat this procedure twice.
  6. Apply foot brake. Move selector lever to position "R" after about 2 seconds. Release foot brake. It is sufficient to lightly press the accelerator pedal in order to shift through all gear ratios of the transmission. Repeat this procedure twice.
  7. Apply foot brake Move selector lever to position 'P' after about 2 seconds. Switch off engine.
  8. Connect diagnosis system and check transmission fluid temperature. Leave engine running and raise vehicle. At oil temperature between 86-122°F (30-50°C), detach hydraulic unit and Special Tool (24 8 100).
  9. The gearbox is probably not completely filled if no oil flows out of the correction hole. Reconnect Special Tool (24 8 100) and pump additional oil into gearbox. Detach Special Tool (24 8 100) and wait until oil overflows and then reattach screw plug. See TORQUE SPECIFICATIONS . If the screw plug is not fitted correctly, oil will continue to flow out of the screw plug as it expands as the temperature increases. This will cause the oil level to drop (gearbox damage).
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