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Kinda hard to tell because it is so spread out. I would suggest cleaning it up and checking it again in a week or so to see if you can get a better idea of the origin point.
I would also check and see if you can feel some vacuum from the oil filler tube. Just take off the cap and put your hand over it with the engine at idle. If you can feel a pull that may point to a failing air-oil separator (AOS).
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'99 black 986
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