2. Place a drain pan of suitable capacity under the differential.
3. Remove the drain plug from the bottom of the differential housing (see illustration) and drain the oil into the prepared container.
4. After the oil stops leaking, feel the plug for any metal filings stuck to it, then wipe it clean, screw it back in place and tighten it securely.
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Note: The presence of sawdust on the plug indicates wear of the internal components of the assembly, the condition of which should be checked at the earliest opportunity.
5. Unscrew the filler/inspection plug from the gearbox housing (see section Checking the differential lubrication level). And using a hand pump, syringe or funnel, fill the differential with the required amount of fresh oil of the required grade – the oil level should reach the lower edge of the hole.
6. Screw the plug back in place and tighten it securely. Lower the car to the ground.
7. Take the vehicle for a short drive, then check the differential lubrication level again.