Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Time Pressure; Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport
Aircraft
While on climb out shortly after the 10;000 foot checklist; I noticed our oil pressure was in the amber range. The Captain checked the left engine oil quantity on the MFD and it indicated 2 quarts. I started the Low Oil Pressure checklist which lead to the Precautionary Engine Shutdown checklist. We secured the engine; [advised ATC] and headed back ZZZ. I called Flight Attendant and told her what the situation was; made a PA; and we continued to land safely in ZZZ. I cannot answer this as I am not a mechanic and do not know why the engine lost oil. I feel like we took all appropriate actions in a timely manner. If this happens in the future; I would maybe try to slow down a bit and delay the flaps 22 extension to short final as we were heavy and airplane wouldn't hold altitude after we extended the gear down/flaps 22. We retracted the flaps back up to 9 to be able to hold altitude which worked well; and then re extended the flaps to 22 on short final. I think overall; we did what we were trained to do and the Captain even made a smooth landing. After landing; we taxied in and parked with no issues.
Air Carrier First Officer reported an engine shutdown due to oil pressure loss.