| Summary: | Utilizing waste cooking oil (WCO) as an alternative fuel to supplement the diesel fuel is an interesting idea since it is renewable, can avoid debating food to fuel as well as promote recycling. However, the physiochemical properties of WCO are poorest that make it unsuitable to be used directly to the diesel engine. So that, this research blend 30% volume based of WCO with 70% volume based of conventional diesel fuel and it is called WCO30D70. On top of that, this project also adding 5 mg of aluminum oxide (Al2O3) in 250 ml of the WCO30D70 as a metallic additive. By using this mixing formula, the results show that the density and kinematic viscosity were reduced and the calorific value was improving than raw WCO that closed to the conventional diesel fuel. The results from engine performance and emissions test indicate that using WCO30D70 and metallic additive could not be better than the one using conventional diesel fuel. Also, this project found that the metallic additive was accumulate inside the fuel injector after the fuel injector was dismantle. This condition was expected to be the main reason for the diesel engine run with WCO30D70 and metallic additive has poorer engine performance and emissions. Thus, it can be concluded that the metallic additive is not suitable to be used in the blended fuel of WCO and conventional diesel with the splash mixture technique. © 2023 Author(s).
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