What was found
(CAN) DURING FLIGHT, THE LT ENG TEMP GAUGE WENT INTO THE RED ZONE 3 TIMES & EACH TIME LASTED AROUND 3 TO 5 SECONDS. THE PILOT PULLED BACK THE POWER TO REDUCE THE OIL TEMP & OIL TEMP WAS NORMAL AT LOW POWER SETTING. CREW DECIDED TO TURN BACK TO THE AIRPORT & ACFT LANDED UNEVENTFULLY. MFG WILL INVESTIGATE TO ESTABLISH ROOT CAUSE & PROVIDE INFORMATION THROUGH SUBSEQUENT SERVICE DIFFICULTY REVIEW MEETING & SUPPORTING DOCUMENTS OR OTHER AGREED UPON COMMUNICATIONS.