What was found
NR 4 ENGINE OIL TEMPERATURE WENT UP TO AND STAYED AT 140 DEGREES. INCREASED POWER FROM CRUISE TO MCT, TEMPERATURE DECREASED TO 134 DEGREES AFTER 15 MINUTES. CREW SECURED THE NR 4 ENGINE, SECURE TIME WAS 0515 Z, WINDMILLING OIL PRESSURE WAS 25 PSI. AIRCRAFT LANDED WITHOUT FURTHER PROBLEM AT ILN. REPLACED NR 4 OIL TEMPERATURE REGULATOR AND TEMP BULB IAW DC 8 MM CHAPTER 79. ENGINE OPS CHECKED GOOD ON GROUND RUN.