As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE OIL FILTER ADAPTER HAD SEPARATED, PULLED OUT OF OIL PUMP HOUSING, DUE TO THE FAILURE/SHEARING OF THE ATTACHMENT THREADS. THIS FAILURE ALLOWED ALL ENGINE OIL TO BE PUMPED OVERBOARD AND CAUSING AN OFF AIRPORT LANDING. THIS PART IS THE SUBJECT OF AD 96-12-22 AND THE OWNER AND MECHANIC STATE THAT IS WAS COMPLIED WITH 11 MONTHS PRIOR.