Seems the SA is not sure about where the oil is coming from...., so suggest that before you throw $$$$ to chase the source of the leak, clean the area and confirm what is the true source; as someone mentioned before, there are other more likely causes, with much less effort and cost to fix.

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E70 - 3.0si & F10 - 535ix
Previous Cars:
E34 - 525i, E39 - 530i, E60 - 530i