What was found
THE PILOT REPORTED THAT THE LEFT ENGINE OIL PRESSURE BEGAN FLUCTUATING NEAR THE LOW REDLINE. THE PILOT PERFORMED A PRECAUTIONARY INFLIGHT SHUT DOWN OF THE LEFT ENGINE AND DIVERTED. LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE LEFT ENGINE AND FOUND OIL LEAKING FROM THE INLET AREA. FURTHER INVESTIGATION FOUND THAT THE OIL BREATHER SKEET TUBING INNER WALL COLLAPSED NOT ALLOWING THE OIL SYSTEM TO VENT PROPERLY. REPLACED THE SKEET TUBING, PERFORMED ENGINE GROUND RUNS NO OIL LEAKS WERE PRESENT. NO OIL CONSUMPTION WAS NOTED ON THE GROUND RUN.