Flight Crew Last 90 Days 100; Flight Crew Total 11500; Flight Crew Type 750
Aircraft Equipment Problem Critical
Flight Crew Diverted; General Declared Emergency; General Maintenance Action
Aircraft
While enroute at FL360 we noticed the Number 2 Engine oil quantity was at 40%. As we monitored it; it continued to decrease. The Captain initiated a dialogue with Dispatch and Maintenance and all agreed to keep monitoring it and let them know if we diverted. The oil quantity decreased to 25% and we decided to declare an emergency and divert. At this point we were coming up on the front range and the weather in [our divert airport] was clear. We advised the flight attendants and passengers and landed without incident. We could not find a checklist for low oil quantity; only for low oil pressure which we never got (but probably would have if we continued). We did not shut the engine down.
Oil quantity had gone from 72 to 25. All appropriate departments and ATC were notified while enroute.
When the right engine oil quantity continually decreased to only 25% the flight crew of a B737 elected to declare and emergency and divert to a nearby airport.