Propeller law SFOC Specific fuel oil consumption RT-flex96C engine De-rating Standard tuning Delta tuning Low load tuning Common rail WECS9520 Wartsila engine control system 9520 Exhaust gas waste gate PLS Cylinder plus jet lubrication system ICMS Integral control & monitor system EGE Exhaust gas economizer Exhaust gas by pass damper 廢氣節熱器 節能設計