What was found
DURING A FLIGHT, THE CREW REPORT INDICATED THAT THEY RECEIVED INDICATION OF LOW OIL PRESSURE FOR THE LT ENGINE. THE CREW COMPLETED CHECKLIST ITEMS, REDUCED POWER TO IDLE ON THE AFFECTED ENGINE. THE CREW THEN DECLARED AN EMERGENCY AND ELECTED TO DIVERT TO AN ALTERNATE AIRPORT KLBL FOR A PRECAUTIONARY LANDING. AFTER LANDING THE CREW FOUND THAT ENGINE OIL WAS COATING THE LEFT SIDE OF THE AIRCRAFT AFT OF THE PYLON. TROUBLESHOT THE ENGINE FOR THE LEAKS THAT CAUSE THE LOSS OF OIL. T DETERMINED THAT THE OIL TANK FILL TUBE O-RING WAS CUT AND ALLOWED OIL TO VENT OVERBOARD. THE OIL FILTER AND CHIP DETECTOR WERE CHECKED FOR METAL DEBRIS, BUT NONE WAS NOTED. A NEW O-RING WAS INSTALLED ONTO THE FILLER CAP. THE OIL TANK WAS DETERMINED NOT TO BE COMPLETELY EMPTY AND ONLY REQUIRED 3.5 QUARTS OF FRESH OIL TO INDICATE FULL. ENGINE RUNS TO FULL POWER WERE COMPLETED AND NO LEAKAGE WAS DETECTED. AIRCRAFT WAS RETURNED TO SERVICE.