A300 CREW RETURNED TO THEIR DEP ARPT AFTER EXPERIENCING FLUCTUATING OIL TEMP INDICATIONS. THE ACFT WAS WRITTEN UP FOR THE SAME PROB THE LAST FLT.

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INBOUND CREW WROTE UP #1 ENG AS HAVING LARGE OIL TEMP FLUCTUATIONS (ECAM) DURING THE FLT. MAINT WAS AT THE PLANE WHEN WE ARRIVED. THEY DECIDED TO CHANGE THE SENSOR AT THE ENG. 3 HRS LATER; AFTER THE WORK AND A TEST RUN AT THE GATE; WE DEPARTED. ALL WAS NORMAL DURING START; TAXI AND TKOF. DURING CLBOUT; WE NOTICED THE OIL TEMP STARTING TO FLUCTUATE AGAIN. AFTER A FEW MINS OF MONITORING; I DECIDED TO RETURN TO JFK. WE NOTIFIED ATC OF OUR INTENTIONS AND RECEIVED A CLRNC BACK TO JFK. ALL OTHER INDICATIONS ON THE ENG APPEARED NORMAL; SO I DECIDED TO KEEP THE ENG RUNNING FOR OUR APCH AND OVERWT LNDG. I BRIEFED THE FLT ATTENDANTS OF THE SIT AND WHAT TO EXPECT. WE WERE PLANNING A NORMAL APCH AND LNDG WITH THE NORMAL PARADE OF EMER VEHICLES SURROUNDING US ON THE TRIP TO THE GATE. THE NEW FO DID AN EXCELLENT JOB OF FLYING THE AIRPLANE AND WORKING WITH ATC AS I COMPLETED ALL MY TASKS. I DECIDED TO LAND THE PLANE SINCE THIS WAS HIS FIRST FLT ON THE NEW EQUIP. THE APCH AND LNDG WENT SMOOTH. WE TAXIED TO THE GATE. I COMPLETED THE REQUIRED PAPERWORK AND ADVISED DISPATCH OF THE DETAILS. AFTER ALL WAS SAID AND DONE; I REALIZED I NOTIFIED ATC OF THE SIT AND REQUESTED THE EMER EQUIP TO BE STANDING BY; BUT I NEVER DID ACTUALLY DECLARE AN EMER OR STATE I WAS EXERCISING CAPT'S EMER AUTH WITH ZNY. THIS IS REQUIRED PER FLT MANUAL AND MOST OF ALL; IT IS THE BEST WAY TO HANDLE IT.