Narrative:

It was suspected that the loss of engine oil could have occurred during the replacement of gen #1. During our preflight; the captain and I noted 10 qts and 11 qts of oil on each respective engine. My captain and I were operating flight to ZZZ. The flight was operated in VMC conditions and took off without any issues. In the last bit of our cruise phase of flight; I happened to notice that the engine 1 oil pressure was slowly dropping. We opened the oil page to find that our oil quantity was dropping as well. We decided to reduce thrust on engine 1 to idle and consult the QRH. At the time we opened the checklist to the oil low pres checklist the oil pressure indication was in the red range. In addition; ATC was already stepping us down on the arrival into ZZZ. After running the appropriate checklists; we advised ATC that we would continue to ZZZ as we could see it in the distance and the aircraft was under positive control and no immediate danger was present. Additionally; our decision to continue to ZZZ was based on runway length availability; where we were in the arrival phase of flight; size and resources. Since we were without ACARS; we appropriately divided our duties to prepare the airplane for landing; notify the company; and gather performance data. In such a short amount of time; we were able to accomplish all our tasks without any issues. ATC was extremely accommodating and cleared traffic so we could head directly towards the field. The flight landed safely on [runway] xxl in ZZZ without any issues and we were met by crash fire rescue equipment. They escorted us to the gate. Overall the event was textbook and went extremely smooth.

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Original NASA ASRS Text

Title: An ERJ flight crew reported that during cruise an engine's oil pressure dropped into the red range.

Narrative: It was suspected that the loss of engine oil could have occurred during the replacement of GEN #1. During our preflight; the captain and I noted 10 qts and 11 qts of oil on each respective engine. My captain and I were operating flight to ZZZ. The flight was operated in VMC conditions and took off without any issues. In the last bit of our cruise phase of flight; I happened to notice that the Engine 1 Oil Pressure was slowly dropping. We opened the oil page to find that our oil quantity was dropping as well. We decided to reduce thrust on Engine 1 to idle and consult the QRH. At the time we opened the checklist to the Oil Low Pres Checklist the oil pressure indication was in the red range. In addition; ATC was already stepping us down on the arrival into ZZZ. After running the appropriate checklists; we advised ATC that we would continue to ZZZ as we could see it in the distance and the aircraft was under positive control and no immediate danger was present. Additionally; our decision to continue to ZZZ was based on runway length availability; where we were in the arrival phase of flight; size and resources. Since we were without ACARS; we appropriately divided our duties to prepare the airplane for landing; notify the company; and gather performance data. In such a short amount of time; we were able to accomplish all our tasks without any issues. ATC was extremely accommodating and cleared traffic so we could head directly towards the field. The flight landed safely on [Runway] XXL in ZZZ without any issues and we were met by CFR. They escorted us to the gate. Overall the event was textbook and went extremely smooth.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.