As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT NOTICED OIL SEEPING FROM AROUND OIL CAP AND FILLER NECK. OIL TANK VENT WAS INSPECTED WITH NO DEFECTS FOUND. ENG COMMPRESSION WAS TAKEN AND FOUND SATISFACTORY. OIL CAP WAS FOUND TO BE A LOOSE FIT. A NEW CAP GASKET WAS INSTALLED AND CAP WAS ADJUSTED FOR A TIGHTER FIT. ENG WAS GROUND RUN AND FOUND SATISFACTORY. OIL TANK MAY HAVE BEEN FILLED TO TOP OF NECK AND WITH A POOR SEALING CAP OIL WILL SEEP FROM TANK FILLER NECK.