Narrative:

[We were on a] ferry [flight] at cruise of FL370. Pilot in command (non flying pilot) completed cruise checklist and discovered right engine oil quantity was 7.5 quarts low. Crew completed engine oil level low checklist and declared emergency with center. We then requested a lower altitude and immediate return to ZZZ. Oil level continued to decrease and the oil low caution message illuminated. We elected to perform a precautionary engine shutdown and began an immediate return to ZZZ. As we descended we then queried center for another alternate field closer than ZZZ. Center advised that ZZZ1 was only 70 miles away; so we the elected to use ZZZ1. Arriving at ZZZ1 we performed a single engine landing to runway 20. Crash and rescue was requested and standing by. An uneventful landing was made and the aircraft taxied to the local FBO. Post flight inspection of the right engine oil sight gauge showed no oil and oil coated the underside of the cowl.the best way I see to prevent this again would be to conduct an engine run up and leak check prior to releasing an aircraft for flight; after engine maintenance of this nature is completed.

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Original NASA ASRS Text

Title: CE750 flight crew discovers right engine oil quantity low and decreasing after level off in cruise at FL370. The engine is shut down and the flight diverts to the nearest suitable airport. Maintenance had recently been preformed to correct this same problem.

Narrative: [We were on a] ferry [flight] at cruise of FL370. Pilot in Command (Non Flying Pilot) completed cruise checklist and discovered right engine oil quantity was 7.5 quarts low. Crew completed engine oil level low checklist and declared emergency with Center. We then requested a lower altitude and immediate return to ZZZ. Oil level continued to decrease and the oil low caution message illuminated. We elected to perform a precautionary engine shutdown and began an immediate return to ZZZ. As we descended we then queried Center for another alternate field closer than ZZZ. Center advised that ZZZ1 was only 70 miles away; so we the elected to use ZZZ1. Arriving at ZZZ1 we performed a single engine landing to Runway 20. Crash and Rescue was requested and standing by. An uneventful landing was made and the aircraft taxied to the local FBO. Post flight inspection of the right engine oil sight gauge showed no oil and oil coated the underside of the cowl.The best way I see to prevent this again would be to conduct an engine run up and leak check prior to releasing an aircraft for flight; after engine maintenance of this nature is completed.

Data retrieved from NASA's ASRS site as of April 2012 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.