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Today, fossil fuel replacement and pollutant emissions reduction can be assured by hydrogen use at the automotive diesel engine, obtaining the engine energetic performance improving. The hydrogen has good combustion proprieties. The paper presents some experimental investigations results carried out at an automotive K9K engine diesel at 2000 rev/min speed and 70% load. They showed that hydrogen might be suitable partial substitute of diesel fuel. The hydrogen use assures the thermal efficiency increase due to combustion improvement through homogeneous air-hydrogen mixture rise. The experimental investigations results show that specific energetic consumption decreases with ~8%, the thermal efficiency increases from 31.9% to 34% due to combustion improvement at the hydrogen content increase. In the same time, due to combustion improvement HC and smoke emissions level decreases with 15% respectively 20%. NOx emissions level decreases with 11% comparative to diesel engine at for a 12% percent of substitute ratio of diesel fuel by hydrogen. At the higher percents of substitute ratio of diesel fuel by hydrogen the NOx emissions level increases due to temperature rise. A great advantage is the CO2 emission level decrease with 12% at the increase of percent of substitute ratio of diesel fuel by hydrogen.