The present paper discusses the experiment carried out on a single-cylinder diesel engine utilizing waste cooking oil methyl ester and producer gas in dual-fuel mode. Various experiments were conducted to measure the physiochemical properties of both biodiesel and producer gas. Simultaneously, emission analysis was performed at different loading conditions with various diesel blends. The results were contrasted with data provided by various researchers. The results showed that carbon dioxide (CO2) and carbon monoxide (CO) show marginal increases, whereas nitric oxide (NO) and hydrocarbon (HC) show a reducing curve, for all prepared test fuels in dual-operation mode compared to that of single operating mode under different loading conditions. The fuel blends show better emission characteristics than that of diesel in both single and dual fuel modes of operation.