Diesel fuel additives are chemicals which are added to the vehicles fuel to improve engine performance, combustion properties, and emission characteristics. In this paper, the experimental investigations of the effect of diesel-biodiesel-acetone emulsion fuels on the performance and emissions of a direct injection diesel engine have been reported. The tests were conducted on one-cylinder naturally aspirated compression ignition engine operated at 1600 rpm. Measured characteristics were torque, power, brake thermal efficiency, specific fuel consumption, exhaust gas temperature, and exhaust gases of CO, CO2, unburned hydrocarbons (UHC), NO, and O 2 .The obtained results show that the torque, power, and Break Thermal Energy were increased when we compare the engine operation with pure diesel fuel. Additionally, the specific fuel consumption and engine exhaust gas temperature were reduced. The CO, UHC, and soot emissions were decreased. However, the NO emission was increased.