Narrative:

We were en route to ZZZ1 at FL300 when we received a low engine oil pressure warning on engine #2. The warning lasted only about 2 seconds; and then went out. We observed the engine oil pressure to be varying significantly; but still in the low green range. We performed the emergency checklists; for low oil pressure and for fluctuating engine oil pressure. All other indications were normal. I contacted our maintenance control and dispatcher via commercial radio patch. We decided that a precautionary landing at ZZZ was the best course of action. We informed ATC; and were cleared directly to the ZZZ airport. I informed the flight attendant; the passenger; and ZZZ station operations of our situation and our intentions. During descent into ZZZ; oil pressure was stable in the low green range with no oil pressure warning; and the engine operating normally. On short final; the engine oil pressure warning went off again; but stayed on this time. The engine continued to perform normally. The first officer (PF) made a very nice; uneventful landing. As we cleared the runway onto the taxiway; the engine oil pressure indication was still illuminated for the #2 engine; so we shut down the #2 engine. Callback conversation with reporter revealed the following information: the reporter stated the cause of the low oil pressure was a failed engine oil seal. The identity of the seal and location on the engine is unknown. The engine was a general electric CF34-3a1.

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Original NASA ASRS Text

Title: A CL65 AT FL300 DIVERTED DUE TO #2 ENG LOW PRESSURE INTERMITTENT WARNING. ON APCH WARNING ON STEADY. SHUT DOWN ENG ON TAXI TO GATE. CAUSED BY ENG OIL SEAL FAILURE.

Narrative: WE WERE ENRTE TO ZZZ1 AT FL300 WHEN WE RECEIVED A LOW ENG OIL PRESSURE WARNING ON ENG #2. THE WARNING LASTED ONLY ABOUT 2 SECONDS; AND THEN WENT OUT. WE OBSERVED THE ENG OIL PRESSURE TO BE VARYING SIGNIFICANTLY; BUT STILL IN THE LOW GREEN RANGE. WE PERFORMED THE EMER CHKLISTS; FOR LOW OIL PRESSURE AND FOR FLUCTUATING ENG OIL PRESSURE. ALL OTHER INDICATIONS WERE NORMAL. I CONTACTED OUR MAINT CTL AND DISPATCHER VIA COMMERCIAL RADIO PATCH. WE DECIDED THAT A PRECAUTIONARY LNDG AT ZZZ WAS THE BEST COURSE OF ACTION. WE INFORMED ATC; AND WERE CLRED DIRECTLY TO THE ZZZ ARPT. I INFORMED THE FLT ATTENDANT; THE PAX; AND ZZZ STATION OPS OF OUR SITUATION AND OUR INTENTIONS. DURING DSCNT INTO ZZZ; OIL PRESSURE WAS STABLE IN THE LOW GREEN RANGE WITH NO OIL PRESSURE WARNING; AND THE ENG OPERATING NORMALLY. ON SHORT FINAL; THE ENG OIL PRESSURE WARNING WENT OFF AGAIN; BUT STAYED ON THIS TIME. THE ENG CONTINUED TO PERFORM NORMALLY. THE FO (PF) MADE A VERY NICE; UNEVENTFUL LNDG. AS WE CLRED THE RWY ONTO THE TXWY; THE ENG OIL PRESSURE INDICATION WAS STILL ILLUMINATED FOR THE #2 ENG; SO WE SHUT DOWN THE #2 ENG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE CAUSE OF THE LOW OIL PRESSURE WAS A FAILED ENG OIL SEAL. THE IDENTITY OF THE SEAL AND LOCATION ON THE ENG IS UNKNOWN. THE ENG WAS A GENERAL ELECTRIC CF34-3A1.

Data retrieved from NASA's ASRS site as of January 2009 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.