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A new oxygenate of di-(2-ethoxyethyl) carbonate was synthesized, and its structure was identified by FT-IR, 1H NMR and GC-MS analyses. The effects of addition of the substance to diesel fuel on fuel properties and engine performance were studied. Results showed that this oxygenate is miscible with individual hydrocarbons in any proportion under normal temperature of 25°C. When di-(2-ethoxyethyl) carbonate is introduced to a diesel fuel, kinematic viscosity does not change notably, smoke point increases linearly. Flash point and solidifying point decline remarkably even at low content level of 5%(v) of the oxygenate, whereas they do not decrease further notably with its content increasing. The compound does not exert corrosion effect on cupric metal. When a diesel engine was fueled with the diesel fuel containing 25%(v) of the oxygenate.