As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT RECEIVED A "LOW OIL PRESSURE" CAUTION. PILOT FOLLOWED THE PROCEDURE AND REDUCED POWER BUT OIL PRESSURE DROPPED MORE. THERE WAS NO OTHER INDICATION OF ENGINE DISTRESS. PILOT CONTINUED TO THE DESTINATION APPROXIMATELY 20 MINUTES. AFTER AN UNEVENTFUL LANDING THE OIL WAS FOUND TO BE 4.5QTS LOW. MAINTENANCE FOUND NO EXTERNAL OIL LEAKS. OIL IS SUSPECTED TO HAVE BEEN EJECTED OUT THE BREATHER SYSTEM.