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I would vote on a plugged PCV valve myself. Rare, but it happens, and is easy to check. Just pull it out and see if it rattles.
Clean the underside of the car real good and start the engine. It'll be easier to see where the oil is coming from when you aren't driving around. Manifold pressure will be extremely high with a plugged PCV valve, forcing gases/oil to the weakest parts of the manifold seals, usually the rear of the intake.
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