B737-800
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Aircraft Equipment Problem Critical
Flight Crew Diverted; Flight Crew Landed in Emergency Condition; General Flight Cancelled / Delayed; General Maintenance Action
Aircraft
We were at cruise when we noted the right engine oil pressure at 6 (normally around 12). We see that the number was going down; showing that we are losing oil. I started to go through the iPad QRH for an appropriate checklist. While looking; the Captain said 'your aircraft' so I took over pilot duties (it was his leg). He was looking at the Low Oil checklist when the oil qty went to zero; and the Captain decided to just shutdown the engine before it got worse. We [advised ATC] and a turn back towards ZZZ. We ran the engine shutdown checklist. I was flying; he was doing the checklists; radio; and the procedures; as recommended by our training department. We were still over max landing weight; and needed time to run all the supplemental checklists and procedures; so we decided to land at ZZZ and burn fuel to get under max landing weight at the same time. The single engine ILS into ZZZ was textbook. We taxied off the runway; was inspected by CFR; and then taxied to the gate.The Low Oil Quantity checklist is not easily found; as it is not in the index as 'low oil quantity' or 'oil low quantity' and it only reference oil pressure in the index.There was no audio or visual alert; when the oil quantity was half what it was supposed to be. We just happened to catch the small indication on the lower screen; and watched it drop to zero. I don't think we could have caught it any faster than we did.
Oil quantity on the Number 2 engine went to 0.
B737-800 flight crew reported loss of engine oil; causing an in-flight shut down and a diversion to a precautionary landing.