What was found
ROUGHLY 5 MINUTES AFTER DEPARTURE, PILOT OBSERVED A ENG HOT OIL WARNING LIGHT ILLUMINATION. HE CHECKED THE OIL TEMP GAUGE AND CONFIRMED AN ENGINE OIL TEMP EXCEEDANCE. HE ANNOUNCED THE WARNING LIGHT AND REDUCED POWER AND AIRSPEED. HE PERFORMED A PRE-LANDING GAUGE CHECK AND ALL INDICATIONS WERE NORMAL EXCEPT FOR THE ENGINE OIL TEMP WHICH WAS INDICATING 116 DEGREES CELSIUS. IT WAS DETERMINED THAT THE THERMOSTATIC OIL COOLER BYPASS VALVE WAS BAD AND IT WAS REPLACED AND ALL INDICATIONS RETURNED TO NORMAL. THIS IS THE THIRD ONE OF THESE TO FAIL AFTER 14823 AND 14934.