B787 First Officer reported a drop in oil quantity and relayed the information via SATCOM to Maintenance and Dispatch.

Narrative

Decrease in Engine Oil Quantity. While enroute we noticed that the Left Engine Oil Quantity was decreasing. I started to write down the UTC time every time that the Quantity decreased by one quart. The rate of decrease seemed excessive so we relayed this information to Maintenance and Dispatch. Shortly thereafter we were contacted by the Dispatcher via SATCOM and they advised us that after consulting with Maintenance and Operations that they were recommending that we change our destination to ZZZ in order to shorten the duration of the flight. We requested and received an amended clearance that was essentially a direct route to ZZZ. We reviewed the Diversion planning in the Flight Manual and we reviewed the Flight Manual checklists that we thought we might need later in the flight. We also reviewed the Procedures Manual. The flying pilots took over the flying positions about an hour outside of ZZZ. Priority handling was requested and the flying pilots decided to use a high speed descent to the airport. We had an uneventful landing on Runway XXL at ZZZ. Even though the Oil Quantity Indication was very low on the Left Engine it continued to operate normally throughout the duration of the flight.