What was found
KOAK - FLT EIA 2955 - NR 3 ENGINE OIL QUANTITY DROPPED TO 1.5 GALLONS, PRESSURE AT 38 PSI. SHUT DOWN ENGINE AND RETURNED TO OAK. THERMAL DISCHARGE OF 6 TIRES AFTER APPROXIMATELY 30 MINUTES. FOUND NR 3 ENGINE OIL CAP SECURE, BUT PORTION OF O-RING SEPARATED. REPLACED OIL CAP O-RING AND SERVICED ENGINE PER 79-10-00. INSPECTED AIRCRAFT FOR OVERWEIGHT LANDING. INSPECTED ENGINE FOR FURTHER LEAKS, NONE FOUND. REPLACED 6 EACH MWT ASSEMBLIES. (X)