The rear axle reducer of the all-wheel drive model Audi-100 is filled with 1.5 liters of gear oil of viscosity grade SAE 9G with a quality specification of API GL 5. An oil change is not provided, but an oil level control is prescribed.
An oil-stained rear axle gearbox housing is an alarming sign. In this case, it is necessary to unscrew the control screw plug in order to check whether the oil level is still at the level of the lower edge of the filler hole. Otherwise, add oil.
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