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Today’s world is changing very quickly; the global situation on the fuel markets is unstable due to geopolitical conditions. Entities like the US Environmental Protection Agency are forcing engine manufacturers to produce more efficient products. To fulfil those rising expectations, many solutions for new engines are being developed, focusing on engines for the commercial and public transport sectors. One of these ideas is an engine with an alternative fuel supply system. The compressed ignition engine with a dual fuel system is presented as an answer to the changing and demanding market conditions. Compressed natural gas (CNG) was used as an alternative fuel, due to its features and its competitive price compared to the other types of fossil and alternative fuels. The point of departure was a compressed ignition engine (inline four cylinders with a turbocharger), direct ignition and a mechanical fuel pump. The alternative fuel system included four CNG injectors and a special control unit, which was adopted on the engine. Gaseous and particle emissions are presented together with engine operation parameters for different engine speeds and loads. Each load as well as speed points were performed in Diesel mode and in Dual Fuel mode, with four different factors of torque replacement by CNG, to compare the influence of CNG on the engine.