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It is well known that alcohol based fuels may have been regarded as one of the alternative fuels because they have several physical and combustion properties similar to gasoline. Ethanol and butanol are alcohols considered as the most promising biocomponents for currently used conventional fuels. However, taking into account the numerous advantages of butanol over ethanol, and its properties, closer to those of gasoline, it is believed that it has greater application potential in the future environmentally-friendly fuels. For these reasons, butanol is under consideration to replace ethanol as an alternative fuel to gasoline especially as a gasoline blending bio-component. Therefore, this paper is focusing on the assessment of the influence of butanol addition to gasoline on harmful deposit formation in a various generation of spark ignition engine. Currently, only few research papers had discussed in very general this very important problem.