Skyhawk 172/Cutlass 172
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 200; Flight Crew Total 1035; Flight Crew Type 800
Time Pressure
Aircraft Equipment Problem Critical
Flight Crew Landed in Emergency Condition; Flight Crew Returned To Departure Airport
Aircraft
Lost Oil Pressure. Gauge indicated 0. Engine started to run really rough and so I [notified ATC] and returned to the airport for a full stop landing. Used best glide speed to ensure obstacle clearance and ended up having to do one turn over the airport to lose altitude before doing a short approach to a full stop.
C172 instructor reported returning to the departure airport following a loss of engine oil pressure and engine performance.