The rear axle in the Audi A4 quattro is filled with 1.3 liters of gear oil of viscosity grade SAE 90 with quality specification GL 5. An oil change is not provided, but only a check of its level. A sign of alarm is the oil-stained rear axle drive housing. In this case, you need to unscrew the screw plug of the control and filler holes in order to check whether the oil level still reaches the lower edge of the filler hole. If not, add oil.
Rear axle drive quattro
There is a drain plug on the bottom of the rear axle differential block.
There is a screw plug on the back of the rear axle differential block (1) control and filler holes, under it is a drain plug (2).
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