Challenger 300
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Confusion; Troubleshooting
Aircraft Equipment Problem Critical
Air Traffic Control Provided Assistance; Air Traffic Control Issued New Clearance; Flight Crew Landed As Precaution; Flight Crew Diverted; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
Day VMC conditions prevailed I was acting as pilot flying. While climbing through 25;000 ft. the Caution CAS message 'L-ENGINE OIL PRESSURE HIGH' was displayed intermittently at first and then latched. PF (Pilot Flying) and PM (Pilot Monitoring) noted elevated engine oil pressure readings and slightly elevated oil temperature. I requested to level at 29;000 ft. and fly present heading. I called for the QRH actions for the associated CAS message which were to simply reduce power on affected engine. End of procedure. As power was reduced intermittent 'L-ENGINE OIL PRESSURE HIGH' messages remained displayed. No messages were displayed; or abnormal indications were displayed at idle thrust setting.We elected to discontinue the flight and divert to ZZZ. I [advised ATC] as it was unclear in that moment if a precautionary shut down would be required. We elected to leave the engine running at idle as an extra source of power; bleed air; and hydraulics. We landed at ZZZ in degraded condition; left engine at idle; without incident. Oil was found on the bottom of the cowling during the post flight.Passenger accommodations were made; and we recovered the trip with another aircraft.
Climbing through the mid-20s we began receiving multiple intermittent Left Engine Oil Pressure High CAS messages. The oil pressure indication confirmed the CAS. We leveled at 29;000 ft. and executed the single step QRH procedure; retard affected thrust lever. This reduced the oil pressure; but the CAS message and amber pressure indication returned. We reduced the power on the left engine to idle; [requested priority handling]; and announced intentions to divert to ZZZ. ATC descended us and re cleared us to ZZZ. We kept the left engine operating at idle for the remainder of the flight; and we landed uneventfully from a visual approach.
CL300 flight crew reported diverting following a high engine oil pressure CAS warning and elevated oil temperature.