Cessna Stationair/Turbo Stationair 6
Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 10; Flight Crew Total 2000; Flight Crew Type 400
Aircraft Equipment Problem Critical
Flight Crew Inflight Shutdown; Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport
Aircraft
Departed [and] filed an IFR flight plan for 6;000 ft. Level at 3;500 ft just about the time to pick up IFR plan the aircraft's oil pressure gauge went off; alerting a loss of oil pressure. The aircraft is equipped with a Garmin G1000. 15 seconds later I turned the aircraft 180 degrees and headed back to ZZZ. Approximately 2.5 NM from ZZZ the aircraft engine seized (quit); no windmilling. Dead sticked the aircraft from an altitude of 3;500 ft. to a successful landing on Runway XX with a ground roll of 400 to 500 ft. to a full stop. All occupants safe; no injuries. Aircraft engine settings prior to low oil pressure indication was at cruise performance. I experienced no vibration; or rough engine performance prior to the engine quitting. After landing I noticed engine oil under belly; landing gear and wheel pants and large puddle of oil on the runway under the engine.[FBO Maintenance] will be dispatched to determine what failed in the engine. The aircraft is a 2009 CT206/G purchased new - approximately 460 TT on engine and airframe.I have no idea what caused the engine failure. The aircraft is very well maintained and the engine is never flown to max settings with the exception on takeoff.
C206 Pilot reported a safe return for a dead stick landing at departure airport after the engine seized shortly after departure.