Biodiesel is an alternative fuel made from vegetable oil or animal fat that can be used as a substitute for diesel fuel. The purpose of the research was to see the effect of methanol addition on biodiesel from used waste cooking oil. The research used a completely randomized design with four treatments which were M1 (methanol 65 ml), M2 (methanol 75 ml), M3 (methanol 85 ml) and M4 (methanol 95 …