What was found
STRONG ENGINE OIL ODOR NOTICED IN COCKPIT DURING INITIAL CLIMB AFTER TAKEOFF. WITH PACKS OFF NR 1 ENGINE RUNNING, RIGHT AFTER NR 2 ENGINE START, GOT STRONG OIL ODOR IN COCKPIT. PACKS STILL OFF. RAN PACKS AND OIL ODOR WENT AWAY. BEFORE ENGINE RUN, RAN PACKS, NO ODOR NOTED IN AIR CON. ACCOMPLISHED HIGH POWER RUN TO CLEAN OUT OIL IN SYSTEM AND REPLACED BOTH COALESCER BAGS. ODOR OCCURRED AGAIN 2 FLTS OUT. LT ENG OIL QTY FLUCTUATING BETWEEN 81 % AND 100 % IN CRUISE. FOUND OIL WETTING IN GAS PATH OF NR 1 ENG. ENGINE REPLACED. RAN ENG AT POWER FOR 30 MINUTES, NO OIL QTY FLUCTUATION NOTED. ACCOMPLISHED SUCCESSFUL NR1 ENGINE BLEED SHIFT TEST.