What was found
DURING CRUISE, PILOT NOTICED RT ENGINE OIL PRESSURE INDICATED ZERO PSI. NEAREST AIRPORT WAS AT DESTINATION, APPROX 30 MILES AWAY. PILOT DID NOT SEE ANY ABNORMAL OIL TEMPS, CYLINDER HEAD TEMPS, EGT, MANIFOLD PRESSURE, FUEL FLOW & FUEL PRESSURE NOMINAL. APPROX 10 MINS & APPROX 7 MILES FROM DESTINATION, RT ENG RPM BEGAN TO DECREASE UNCOMMANDED & FUEL FLOW DECREASED. PILOT FEATHERED RT PROPELLER, & SHUTDOWN RT ENG, LANDED WITHOUT INCIDENT. POST FLIGHT INSPECTION REVEALED A SUBSTANTIAL AMOUNT OF OIL ON LOWER RT NACELLE. VISUAL INSPECTION ISOLATED THE SOURCE OF OIL LEAK TO OIL COOLER OUTLET HOSE INTEGRATED METAL FITTING. HOSE & FITTING ACCUMULATED A TOTAL OF 544 HOURS SINCE NEW & 15 MONTHS SINCE INSTALLATION.