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Fuel Economy & CO2 Reduction in IC Engines is the key driving factor for the Product performance & Customer satisfaction all around the world. The Stringent CO2 Limits calls for Engine Friction Reduction, Engine Downsizing & other Alternative measures. The challenges were to measure the component level Friction Contribution on the Engine & to select the critical contribution parameter & to optimize the same. Oil pump is one such important engine parasitic load which takes up engine power through crankshaft to deliver oil flow rate according to engine demand. The proper functioning of the Oil pump is considered with required engine Oil pressure along with optimum power consumption over various operating speed and temperature. Hence the various Oil pump critical design metrics are reviewed for two cylinder Multi-jet diesel engine to have optimal power consumption and without reduction the Oil pressure at the engine oil gallery.