I just looked in my 986 workshop manual. It shows a cylinder head gasket, but the cylinder head cover (or camshaft housing cover) shows no gasket, just silicone sealant. I've never opened it up myself, so please don't trust my comments as if I'm an expert.
Spark plug tubes are in the same area, and they tend to get leaky and drip oil. They're also easy and cheap to replace.
But Sti-986 brings up a good point: How experienced is your mechanic with the 986?
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