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Recently, awareness on application of renewable fuel leads to creation of biofuels . One of them is biodiesel that can be made by transesterification of vegetable oil. In order to prevent conflict of interest, vegetable oil was replaced by waste frying oil. Transesterification produces two materials, biodiesel as main product and glycerol as by product. By this method, glycerol produced was dark and viscous therefore cannot be used for foods nor cosmetics additive. Nevertheless, with its high amount of energy, glycerol ca be used as biofuel. Glycerol was mixed with methanol up to 10% by volume and applied on external combustion engine. The results show that by providing excess of air, glycerol produces acceptable flame for boiler burner