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but don't try replacing the seal until you have read up how to do it!
you need a special tool to undo the special nut and you need to just tighten the nut back 'to where it was' using a little loctite.

what I would do, is thoroughly clean the diff casing first, then you will be able to see where the oil is coming from....it could be just old caked-in oil on there and a PO has cured the problem...for instance.

Oh and those park brake levers could do with some cleaning and lubrication whilst you are under there...;)
 
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My S3 has the same issue - differential covered in oil, and the tunnel area above the seal looks like it was undercoated with tar. The PO said he didn't replace the seal when I asked about it, but I check the fluid level regularly and it doesn't seem to be leaking during my ownership. So I don't worry about it until I see oil levels beginning to drop.
 
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