As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON A ROUTINE OIL CHANGE, FILTER WAS REMOVED AND CUT OPEN. SOMETHING RATTLING INSIDE WAS FOUND. RUBBER GASKET HAS PIECES MISSING ALONG WITH METAL SLIVERS. PARTS WERE PUMPED INTO ENGINE. ENGINE REMOVED, TORN DOWN. FOUND RUBBER PIECES IN 2 LIFTERS. ENGINE FLUSHED, REASSEMBLED, AND INSTALLED. FILTER DATE CODE - F10E05-1.