Thevetia peruviana, a plant with high oil content, can be used to make biodiesel for diesel engines. Biodiesel is a renewable, eco-friendly fuel made from non-edible sources like wild plants. Transesterification is a method used to improve the properties of biodiesel. This alternative fuel is gaining popularity worldwide due to its sustainability and environmental benefits. Using non-traditional feedstocks like Thevetia peruviana can help reduce the reliance on food-grade oils, making biodiesel production more economically viable.