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The diesel engine in the past few years has improved its market sharing because the new engine technology has reduced the emissions and the diesel engine has relatively cheaper power cost. Nevertheless, in order to meet more restricted emission standards, the NOx, CO, HC, and particulate emissions must be further reduced. Thus, this study will explore the possible fuel additive technology to further reduce the emissions from the diesel engine. In this study the fuel additives EHN, DTBP, MTBE, DMC, Diglyme, Monoglyme, and Ethanol are added into the diesel fuel with two different dosages. These additives are classified into four categories. It is well believed that the fuel cetane number improver such as DTBP (di-t-butyl peroxide) or EHN (2-ethylhexyl nitrate) can increase the fuel cetane number and thus reduce the emission level.