What was found
(CAN) TWO MIN. AFTER T/O, THE CABIN FILLED WITH SMOKE AND AN EMERGENCY WAS DECLARED. THE CREW RETURNED TO THE DEPARTURE AIRPORT WHERE ON SHORT FINAL AT 100` ALTITUDE, THE LOW OIL PRESSURE WARNING CAME ON ENGINE NR 2. THE A/C LANDED SAFELY AND BOTH ENGINE WERE SHUT DOWN BEFORE THE PASSENGERS WERE DEPLANED ON THE RUNWAY. POST FLIGHT INSPECTION FOUND A LARGE QUANTITY OF OIL IN THE ENGINE INLET WITH NONE LEFT IN THE TANK.