What was found
AFTER TAKEOFF, THE NR 2 ENGINE OIL PRESSURE WENT TO ZERO MOMENTARILY. THEN BEGAN FLUCTUATING BETWEEN 40 - 60 PSI. AS THE POWER WAS REDUCED FOR LEVEL FLIGHT THE OIL PRESSURE STABILIZED. AS POWER WAS ADDED, OIL PRESSURE WOULD NOT INCREASE NORMALLY. ON RETURN TO THE AIRPORT, THE THROTTLE WAS PULLED BACK TO BEGIN THE DESCENT FROM 13000 FEET & THE OIL PRESSURE DROPPED TO 0 PSI & REMAINED, INITIATED THE CHECKLIST WHICH CALLED FOR AN ENGINE SHUTDOWN. SHUTDOWN WAS ACCOMPLISHED & LANDED WITH NO FURTHER INCIDENT. REMOVED ENGINE DUE TO HIGH OIL CONSUMTION. INSTALLED A DIFFERENT ENGINE, COMPLIED WITH A PYLON INSPECTION, NO DEFECTS NOTED. COMPLIED WITH A SATISFACTORY LEAK CHECK AND GROUND PERFORMANCE RUN. ALL WORK PREFORMED IAW PN 30C3882, REV 33, AND MAINTENANCE MANUAL REV. 19.