SR20
Flight Crew Air Transport Pilot (ATP); Flight Crew Flight Instructor
Aircraft Equipment Problem Less Severe
Flight Crew Landed As Precaution; Flight Crew Returned To Departure Airport; General Maintenance Action
Aircraft
During the initial phase of flight; the aircraft showed no unusual indications; nor were there any signs of engine abnormality until approximately 1 hour into the flight. During a missed approach procedure climb out from the VOR DME; Student and instructor both noticed some slight engine roughness. Engine indications seemed normal at the time; but IP (Instructor Pilot) noticed that the CHT for cylinder 3 was not reporting on the MFD. In addition to this; the EGT for cylinder three seemed low compared to the other cylinder readings. At 2200 feet; IP decided to return to [departure airport] for a precautionary landing. After landing and taxiing to an FBO; the engine seemed to be acting normally (no longer vibrating; though cylinder 3 still showed no CHT value.) Post flight inspection revealed that the engine compartment seemed to be leaking excessive oil. Ambient temperature on the ground read 31*C; though as stated in the description narrative; [neither] CHT nor EGT temperatures seemed to be affected by this.
SR20 flight instructor reported returning to departure airport after noticing some engine anomalies.