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As an alternative fuel for compression ignition engines, biofuels are in principal renewable and carbon unbiased. However, their use raises technical, economical and environmental issues. A complete technical review on the use of biofuel (pure oil/blend with diesel/blend with diesel in the presence of additives) in CI engines based on performance and emission comparisons with diesel fuel is carried out in this work. It is observed that biofuel seems to be a good option to substantially reduce environmental emissions. Although the majority of biofuels can be used in CI engine without any modifications, change in operating parameters (injection timing, injection pressure & compression ratio) is advisable for improvement in engine performance. Moreover, short run studies show that biofuels have great potential to replace conventional diesel fuel, the review suggests that biofuels produce a various problem when used …