As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT NOTED DROP IN ENGINE OIL PRESSURE IN CRUISE FLIGHT. POSTFLIGHT INSPECTION REVEALED SILICON GASKET (SUCKED) INTO THE ROCKER BOX ALLOWING SUBSTANTIAL OIL LOSS. ENGINE SHUTDOWN, PROP FEATHERED, PRECAUTIONARY LANDING ACCOMPLISHED WITHOUT INCIDENT. (K)