What was found
AFTER ENGINE START NR 3 ENGINE OIL QUANTITY DROPPED, OIL PRESSURE LOW AT IDLE POWER, NO OIL OVER TEMP. REMOVED FILTER AND FOUND CARBON DEPOSITS. CLEANED, REINSTALLED, DRAINED OIL, RESERVICED, INSPECTED N2 TACK SHAFT FOR PLAY AND NONE FOUND. PERFORMED ENGINE RUN, ALL PARAMETERS GOOD REFERENCE M/M 71-00-44. THOUGH NEXT FLIGHT NO FURTHER PROBLEMS ENGINE CHANGED PRECAUTIONARY.