What was found
AT FL 360, WHITE FLASHING BOX APPEARED ON ENGINE DISPLAY #1 ENGINE OIL QTY SHOWED 18%. WHITE BOX WENT SOLID FOR REMAINDER OF FLIGHT. OIL QTY CONTINUED TO DECREASE TO SHOW 0% WHILE INFLIGHT. ALL OTHER INDICATIONS ON #1 ENGINE WERE NORMAL INCLUDING OIL TEMP AND PRESSURE. DIVERTED TO ABQ. AFTER LANDING, TAXIIED TO GATE AND OIL LEAK OBVIOUS ON RAMP. INSTALLED HYD LOCKOUT PLATE & FLAP HANDLE LOCKOUT PLATE. OPENED #1 ENGINE FAN COWL & INSPECTED ENGINE. SUSPECT #1 ENGINE STARTED LEAKING OIL. / R&R'D #1 ENGINE STARTED IAW MM 80-11-01. OPS AND LEAK CHECK GOODTAG NUMBER: P0617497 GAB # 1223610 ISSUE # 3526957POS: 1 PN/OFF: 3505945-12 PN/ON: 3505945-12SN/OFF: GRT33628 SN/ON: GRTA9669