What was found
(CAN) DURING CLIMB PHASE, THE PILOT NOTICED A DROP IN TORQUE INDICATION. THE PROPELLER BEGAN TO AUTOFEATHER AND SMOKE WAS REPORTED COMING OUT FROM THE NACELLE AREA. THE PILOT MADE AN UNEVENTFUL EMERGENCY LANDING. AVIATION TECHS ARE ON SITE AND REPORTED NO OIL IN THE SIGHT GLASS. 5 QUARTS OF OIL WAS ADDED, MOTORED THE ENGINE AND FOUND OIL LEAKING FROM THE GAS GENERATOR DRAIN PLUG.