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In dual fuel combustion process two different fuels are burnt at the same time. Dual fuel combustion has been under investigation and development for many years in terms of utilizing natural gas as a CI (Compression Ignition) engine fuel. It was driven by the fact that methane is regarded as cleaner than conventional diesel fuel hydrocarbons. Dual fuel combustion process made possible utilizing natural gas as a CI engine fuel while avoiding extensive modifications to engine design. It is due to the fact that natural gas possesses a relatively high autoignition temperature, which is a serious advantage over other gaseous fuels and allows to keep the compression ratio high. The dual fuel concept was also studied in terms of utilizing in CI engines liquid fuels with high octane number like ethanol and methanol or liquefied gaseous fuels (LPG). Due to the fact that these fuels are not as much knock-resistant as natural gas, their application may however require lower compression ratio. Nevertheless, utilizing liquid hydrocarbons with low ability to autoignite in CI engines is of high interest especially in the area of oil industry by-products. Therefore, this study aims at the investigation of the potential of utilizing dual fuel system for burning light hydrocarbon fuels in heavy duty compression ignition engines.