Gear Oil, Draining And Filling

Special tools and workshop equipment required 

• If necessary, Oil Filler - Adapter 6: VAS6262/6 
• Charging Device for AWD Clutch Coupling 2: VAS6291A 
• Charging Device For AWD Clutch Coupling 2 - Adapter 3: VAS6291/3 
• Used Oil Collection and Extraction Unit: SMN372500 
• Refer to the Parts Information for the correct original transmission fluid container, gear oil; part number.
• Protective Eyewear
• Acid-Resistant Safety Gloves

• The gear oil in the bevel box must only be drained for a repair. Changing the oil is not intended.

Draining 

• Replace the oil drain plug and fluid filler hole plug after removal.

• Move the vehicle onto a four-column workshop hoist or over a work pit so it is completely level.
• The engine is off.

-- Remove the noise insulation. Refer to OVERVIEW - NOISE INSULATION .

-- Place the : SMN372500  under the transmission.

-- Remove the oil drain plug -2- and drain the gear oil.

-- Install the new oil drain plug -2-.

Filling 

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-- If equipped, remove the nuts -arrow- and then remove the right drive axle heat shield -1-.

-- Route the hose for the : VAS6291A  through the engine compartment.

-- Remove the oil filler hole plug -1-.

-- Install the : VAS6291/3  until it stops.

-- Engage the elbow on the : VAS6291A  with the : VAS6291/3 

• The hose must not sag.

-- Make sure the valve -arrow- is closed.

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-- Attach the fluid container -1- to the : VAS6291A  .

• The : VAS6262/6  must also be used on some fluid containers.

-- Open the valve -arrow- and hold up the fluid container as shown.

• The bevel box is now filled.
• When the bevel box is filled correctly, fluid comes out at the : VAS6291/3  .
  Fig 4: Charging Device For Haldex Coupling 2 - Adapter 3VAS6291/3

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-- If the gear oil leaks out at the : VAS6291/3  , hold the oil container in such a way so that any excess oil flows back into the container.

-- When the oil stops flowing, remove the : VAS6291  .

-- Install the >>old<< oil filler plug and lightly tighten it.

-- Start the engine, engage a gear and let the transmission turn for approximately two minutes.

-- Switch off the engine and remove the oil filler hole plug.

-- Check the oil level and fill again with oil up to the lower edge of the filler hole.

-- Tighten the new fluid filler plug.

• Carefully remove leaking oil from the bevel box.

-- Install the drive axle heat shield. Refer to DRIVE AXLE HEAT SHIELD, REMOVING AND INSTALLING .

Tightening Specifications 

• Refer to OVERVIEW - DRAIN AND CHECK PLUGS
• Refer to OVERVIEW - NOISE INSULATION .