1.C 150 oil pump drive failed = forced landing at home airport
2.PA 39 Fuel selector failed between detents on final = Feather engine and made normal landing
3. PA31. Catastrophic turbo failure and masive oil loss. happened at top of shuttle climb at Tofino BC CYAZ = single engine NDB with a circle to land'
4. S2F. engine blew a big hole in No 2 cyl and then lost oil pressure= feathered engine and RTB
Had a couple of R2800' fail , but I had 3 spare engines so no big deal
For No1 . Aircraft was climbing out of home base when I notice oil press was one needle wideth lower than normal. Told the student to head back home and within about 2 mins oil press slowly rolled down to zero. Shut down engine and Force landed.
For No2 . Private aircraft had a very poor appearance and many snags. The failure was due to the owner poorly maintaining the aircraft which was obvious from its condition
For No3. aircraft previous 4 legs had 4 different pilots who had collectively added 6 litres of oil to the engine. None of them had logged the oil as our SOPS required.
For No4 No indication prior to the low oil press light on.