What was found
DURING TAKEOFF ROLL, APPROX 60 KTS, LT ENG OIL PRESS DROPPED TO 0. LT LOW OIL PRESS LIGHT ILLUMINATED FOR 20 SEC & EXTINGUISHED. RAN ENG TO T/O POWER & PRESS DROPED TO 30 PSI. REMOVED LT ENG. DONE IAW MM, 71-00-03, CHECKED OIL. NO OIL IN SIGHT GLASS, MOTORED ENG FOR 20 SECONDS & RECHECKED OIL, NO OIL IN SIGHT GLASS. SERVICED W/4 QUARTS, RAN ENG FOR 4 MINUTES AT CRUISE. CHECKED FOR EXTERNAL OIL LEAKS. NONE FOUND. SHUTDOWN & CHECKED OIL. OIL REMAINED GOOD. RAN LT ENG AT CRUISE FOR 10 MINS. OIL PRESS NORMAL, CHECKED FOR EXTERNAL LEAKS, NONE FOUND. SHUTDOWN & CHECKED OIL. OIL DROPPED. SERVICED W/2 QUARTS. DISCONNECTED GEARBOX BREATHER LINE, NO UNUSUAL OIL FOUND IN BREATHER.