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Diesel engines are among the most effective engines in the world. Known as strong, economical and robust, they are also recognized for their traditional smoke and high level of nitrous oxides, NO_x emissions. In the present study, a basic diesel engine that meets Euro III emissions standards with NO_x concentration limited to 5.0g/kWh and the particulate matter limited to 0.100g/kWh was performed in order to evaluate its potential of attending Euro VI standards by developing Exhaust Gas Recirculation (EGR) technique. Euro VI will be used in the European community only in 2013 with NO_x limited to 0.4g/kWh and particulate matter to 0.01g/kWh. The main idea is to achieve Euro VI emissions level, changing the EGR components and tuning the injection system. In order to reduce the investigation phase, statistics evaluation were used to define one specific speed and load that render the worst condition to create a …