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In military operations always search the availability of equipment in adverse situations. The flexibility of operating on alternative fuels becomes every day a real need to be sought by all manufacturers who to provide for this segment of market. The main objective of this study was to evaluate the use of mixtures of jet fuel (QAV-1) + diesel and Biodiesel in the operation of diesel engines monitoring the parameters lubricity HFRR (High Frequency Reciprocating Rig) and cetane number fuel and also performance parameters. For this study, was used a diesel engine of 279 kW applied on a dynamometer. For lubricity was used the method HFRR according to the standard ASTM D6079 and for cetane number the results were obtained using ASTM D613. The results contributed to a better understanding of the physical-chemical properties of fuels tested and their contributions to the operation of diesel engines.