As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO HOURS INTO FLIGHT FL380, SAW #3 ENG OIL QTY AMBER BOX AT 4 QTS. IT REMAINED STEADY AT 4, BUT ALTERNATING WHITE/AMBER. NO OTHER ALERTS OR ABNORMAL ENGINE READINGS. DECIDE TO DIVERT DUE TO OVERWATER FLIGHT. #3 ENGINE CONTINUED TO DECREASE TO 1QT. WE SHUTDOWN BEFORE THE ENGINE COULD POSSIBLY CEASE. CONTINUED TO UNEVENTFUL AUTO LAND LANDING. EMERGENCY DECLARED.