The use of internal combustion engines is a reliable and relatively efficient means of getting mechanical power for automotive propulsion and prime movers for generators in power plants. The transport sector is a major consumer of fossil fuels and accounts for over 60% of total air pollution coming from automobiles running on fossil fuels. In this study, an analysis was done on the feasibility of converting conventional engines to biogas or biomethane engines.  The study showed that dual fuel engines can be used with little or no modifications to ran on biogas. However, to run on pure biogas as a fuel, the diesel engines need introduction of the ignition system in addition to gas storage and supply system. Conversion of a petrol engine to 100% biogas is the simplest as it requires minor adjustments related o introduction of the biogas storage and supply system.