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Your Constant Pressure Valve (CPV) is in that area. It's a pretty common leak after the Buna-N o-ring gets brittle. If oil is leaking down between the engine and transmission that's probably it. Do a google search or look on M3Forum for some fixes. With the headers removed, replacing the o-ring would be simple. I would try to get a hold of a Viton o-ring to replace it though.
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