What was found
DURING CLIMB-OUT, NR 1 ENG OIL QUANTITY DROPPED TO 4 QTS. OIL PRESS FLUCTUATE AT 30-35 PSI, OIL TEMP 80DEG C. PULLED NR 1 THROTTLE TO IDLE, OIL QUANTITY CONTINUED TO 3QTS AND STEADY. DUMPED FUEL TO MAX LANDING WEIGHT AND RETURNED TO KFLL. UPON INSPECTION FOUND CUT OIL CAP O-RING. REPLACED O-RING, SERVICE ENGINE OIL TANK. NO LEAKS ON ENG RUN UP.