B737 flight crew reported a loss of oil quantity and drop in oil pressure in the number 1 engine and...

Attributes
ACN	1714051
Time
Date	201912
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Engine
Person 1
Function	Pilot Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Experience	Flight Crew Last 90 Days 101 Flight Crew Type 175
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 149 Flight Crew Type 5505
Events
Anomaly	Aircraft Equipment Problem Critical Deviation - Procedural Weight And Balance

Narrative:

[At] flight level 340; south of ZZZ; direct zzzzz; [the] oil quantity showed 8%. The captain called maintenance control while I flew. I referenced drift down altitude; speed from the FMC and referred to the QRH for low oil pressure checklist and the following engine shutdown checklist since low oil quantity is not included.at approximately XA29; engine number 1 oil quantity at 0% and engine oil pressure began fluctuating from 45 psi to 33 and lower in the amber band. By XA40; oil pressure was approaching red band. At approximately XA40; the captain and I shut down engine number 1. The captain and I decided along with dispatch; after discussing with maintenance control; that ZZZ was the best location to divert to. I accomplished a visual landing to runway xxl; backed up by the ILS xxl. Winds were 330/7; autobrake 3. Crash recovery/fire looked over the aircraft after the landing. All clear; we taxied to gate xx. Taxi on to the gate was uneventful. This does not include all actions that were performed but those I can recall from memory [that] feel important.

Original NASA ASRS Text

Title: B737 flight crew reported a loss of oil quantity and drop in oil pressure in the Number 1 Engine and decided to shut the engine down and divert. An uneventful landing and taxi in was made.

Narrative: [At] flight level 340; south of ZZZ; direct ZZZZZ; [the] oil quantity showed 8%. The Captain called Maintenance Control while I flew. I referenced drift down altitude; speed from the FMC and referred to the QRH for low oil pressure checklist and the following engine shutdown checklist since low oil quantity is not included.At approximately XA29; Engine Number 1 oil quantity at 0% and engine oil pressure began fluctuating from 45 PSI to 33 and lower in the amber band. By XA40; oil pressure was approaching red band. At approximately XA40; the Captain and I shut down Engine Number 1. The Captain and I decided along with Dispatch; after discussing with Maintenance Control; that ZZZ was the best location to divert to. I accomplished a visual landing to Runway XXL; backed up by the ILS XXL. Winds were 330/7; autobrake 3. Crash recovery/fire looked over the aircraft after the landing. All clear; we taxied to Gate XX. Taxi on to the gate was uneventful. This does not include all actions that were performed but those I can recall from memory [that] feel important.

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.

B737 flight crew reported a loss of oil quantity and drop in oil pressure in the number 1 engine and decided to shut the engine down and divert. An uneventful landing and taxi in was made.