This exploratory study portrays the impact of expansion of Biodiesel in little amounts on the execution and outflow attributes of a diesel motor. A diesel motor is a pressure ignition sort IC motor, which utilizes the warmth of packed air to start ignition to smolder the fuel. The ignition in diesel motor is heterogeneous in nature. Diesel motors for the most part have high thermal proficiency, however, more outflow than other SI motors. In this way, the primary concern is to lessen the toxicity from the fumes. Significant poisons in fumes of diesel motor are residue, HC, NOx, CO and SOx. Because of the heterogeneous way of ignition, the ash arrangement is huge in a diesel motor contrast with SI motor. Accordingly, the point of this work is to concentrate on the Biodiesel as a fuel added substance to the diesel and its impact on execution and outflow characteristics. The investigation of diesel motor has been finished by utilizing the mixes of biodiesel with diesel fuel at the rate of 5%, 10%, and 15% . It is found that (10%SB+15%JB+75%D ) biodiesel with diesel is suitable to use as a substitute fuel at the diesel motor as its fuel utilization rate, Brake Specific Fuel Consumption and Brake Thermal Efficiency is near to that of traditional diesel fuel.