B737 Next Generation Undifferentiated
Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 272
Aircraft Equipment Problem Less Severe
Flight Crew Diverted
Aircraft
Upon receipt of the aircraft; the logbook indicated a previous day write-up for 'Excessive oil consumption' on engine number 1. The signoff read; 'Replaced magnetic seal; no leaks noted.' Oil levels were: number 1: 88 percent; number 2: 100 percent. 1.75 hours into the flight; the number 1 was at 49 percent. I notified Dispatch and we continued to monitor the oil loss. Later; 37 percent; and then later 28 percent. At one time I asked Dispatch if they had a preference of action. He said that they had been looking at this long enough. They were ready for either. Operationally; it would be best to continue on [to ZZZ]; Maintenance wise; it would be best to land in ZZZ1. We were estimating landing at ZZZ with 10-15 percent oil quantity. Not knowing at what point we might begin to experience temperature and pressure issues; combined with the possibility of landing single engine at a special airport with a 3.5 degree GS; the First Officer; Dispatcher; and I agreed that a divert to ZZZ1 was the most prudent decision. Landing was uneventful. Upon arriving at the gate; Maintenance was about 99 percent sure what the problem was and thanked us for 'not toasting the engine!'
[Report narrative contained no additional information.]
B737 flight crew reported a diversion due to engine oil quantity decreasing in flight.