What was found
(CAN) LOW OIL PRESSURE/IFSD DURING T/O, OIL PRESSURE WAS LOST, WENT TO ZERO. THE PILOTS COMPLETED THE TAKEOFF, THEN INITIATED THE ENGINE SHUTDOWN. THE ACFT RETURNED TO THE POINT OF DEPARTURE WHERE AN UNEVENTFUL SINGLE ENGINE LANDING WAS PERFORMED. TROUBLESHOOTING IS ON-GOING.