What was found
1.5 HOURS INTO FLIGHT, #4 OIL QUANTITY DROPPED TO 6 QTS. AT ABOUT 2.5 HOURS, QTY SHOWED 0. AT ABOUT 3 HOURS, OIL PRESSURE DROPPED TO 13 PSI AT LANDING. STATUS MESSAGE ENG 4 OIL PRESS(<P>CHECK OIL IND, IND AT 0, VISUALLY CHECK OIL CAPACITY, CAPACITY AT 0. PER MCC INSPECT MAGNETIC CHIP DETECTOR IAW AMM 79-21-00, FOUND CONTAMINATION & LOTS OF METAL DEBRIS. MCC NOTIFIED. LP 1810379 P2: CHK EICAS MSG, ENG LOW OIL PRESS, 0 PSI. AS PER MCC, ADD OIL QTY TO 20, THEN GND CRANK DRY MOTOR, FOUND NO OIL PRESSURE, NO N1 IND IAW AMM 71-00-00. MCC NOTIFIED. LP 1900155 M14: R/R #4 ENG & OPS & LEAK CHK NORMAL PER AMM 71-00-02 & W/C 71-099-02-01.