What was found
(CAN) LT ENG OIL PRESSURE DROPPED FROM NORMAL 92 P.S.I. TO APPROX 60 P.S.I. PILOT REDUCED POWER TO 1100 LBS OF TORQUE. TORQUE STARTED TO FLUCTUATE AND OIL PRESS CONTINUED TO DROP TO 50 P.S.I., PILOT FEATHERED AND SHUT DOWN ENG. DECLARING AN EMERGENCY AND LANDED WITHOUT FURTHER INCIDENT. UPON INSP OF ENG, OIL WAS FOUND L EAKING OUT OF ENG INTAKE. AFTER SOME TROUBLESHOOTING AND DISCUSSION WITH A TECH, IT WAS DECIDED TO REMOVE OIL FILTER HSG, REPLACE O RINGS AND LAP CHECK VALVE SEAT, ON OUTSIDE OF HSG. AS FURTHER PRECAUTION, MAIN OIL FILTER AND CHIP DETECTOR WERE REMOVED, INSPECTED, CLEANED AND REINSTALLED. NO METAL PARTICLES WERE FOUND. ENGINE WAS TOPPED UP WITH OIL AND ENGINE RUNS COMPLETED SERVICEABLE.