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The paper presents some results of examination of DF CI engine fuelled with kerosene-based fuel (Jet A-1) and propane. The aim was to obtain the maximum engine thermal and overall efficiency and checking the engine emissions for the application of significant share of propane as a main source of energy. The fuel which initiates the ignition was Jet A-1 provided by common rail system during the beginning of compression stroke. Propane was provided to inlet manifold in a gas phase. The method of providing of both fuels to the engine cylinder gave allowed to create nearly homogeneous mixture. The results of experiment show that the engine NOX and soot emissions are much lower than for standard CI or SI engines. To control of ignition timing CO2 was used as an additive to the air provided to the engine. The low levels of toxic components in exhaust gases, low cycle by cycle variations (low COVIMEP), and the possibility of control of combustion process by using CO2 would enable future application of this type of fuelling which confine the negative influence on the environment as well as enable to apply an alternative fuels.