Biodiesel is an efficient substitute for diesel due to its unique properties like cutback in greenhouse gas emissions, nonsulfur emissions, non-particulate matter pollutants and insignificant toxicity and biodegradability. This not only helps to reduce the pollution level; it is also cheaper compared to other modes of fuel. When UCO is used as feedstock this again reduces the production cost. In this project, we have used UCO as feedstock and analysed the performance rate(mileage).