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the most common oil leaks next to IMS/RMS are, in order of frequency:
1. the bolts that hold the oil return pumps in the heads
porsche has a TSB on these; the cure is to replace the bolts w/ microencapsulated bolts.
2. spark plug tubes
cure is to replace the spark plug tube w/ new
3. valve cover gasket
cure is to remove the valve cover, clean, and re-seal. this is a total pain in the ass and requires special tools. let it leak.
your first picture looks like it could be number one.
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