Disclosed is an ashless-type engine oil composition. The engine oil composition particularly includes glyceryl monooleate, molybdenum dithiocarbamate and a dihydrocarbyl dithiophosphate metal salt together as a friction modifier. Accordingly, the engine oil composition of the present invention provides advantages of protecting a filter equipped in an exhaust gas after-treatment device and improving gas mileage and engine durability by maintaining sulfated ash in an amount of 0.8 wt % or less based on total weight of the engine oil composition.
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