What was found
ON TAKEOFF AT V1, RIGHT ENGINE OIL PRESSURE LIGHT ILLUMINATED THEN WENT OUT (APPROX. 1 SEC) ON CLIMB-OUT CHECKED OIL PRESSURE GAUGE VERIFIED IN YELLOW AREA (APPROX 10-20 PSI) DID NOT NOTICE ANY ENGINE SURGE OR ABNORMAL NOISES, BROUGHT POWER BACK TO 40 PERCENT TORQUE. RETURNED FOR LANDING. MAINTENANCE ADDED 3 QUARTS OF OIL. OPS CHECK GOOD, RECHECK OIL LEVEL-GOOD. NO LEAKS NOTED.