What Glen said. Another culprit often overlooked is bad cam seals, at the top part of the engine. They leak, and the leak runs down the back of the engine and drips. Sometimes the front cam seals drip too. Take a look at those. Also, oil pan leaks, as the very lightly torqued bolts vibrate loose over time. These are very low torque spec bolts, but you can gently snug them. You can access most, but a couple around the oil filter are hard to get to.
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Ed
85 5spd 928 (guards red overtan)
05 6 spd 997 (slate gray over terra cotta)
928 Owners Club member
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