<![CDATA[The continuous increase in motor vehicle usage has led to a corresponding rise in lubricant oil consumption, resulting in a greater volume of used lubricating oil waste. Various treatment methods can be applied to process used lubricating oil waste, one of which is pyrolysis to convert the waste into liquid fuel. This study was conducted to determine the effect of activated natural zeolite as a catalyst in the conversion of used lubricating oil into liquid fuel. The used lubricating oil was subjected to pyrolysis for 120 minutes at a temperature of 350°C, using a feed volume of 500 mL. Catalyst weight variations of 0 g, 21.5 g, 43 g, 64.5 g, and 86 g were applied. The catalyst consisted of natural zeolite crushed and sieved to 100 mesh particle size. Prior to use, the zeolite was activated using 3 M HCl. The resulting liquid fuel products were evaluated in terms of yield percentage (%Yield), API gravity (°API), density, viscosity, and GC–MS analysis. The pyrolysis process produced 287 mL, 332 mL, 387 mL, 441 mL, and 415 mL of liquid fuel, respectively. The maximum fuel yield was obtained with a catalyst weight of 64.5 g, producing 441 mL of liquid fuel with a yield of 88.2%, a density of 812.2 kg/m³, a viscosity of 2.48 cSt, and an API gravity of 42.56°. The API gravity value indicates that the liquid fuel product can be classified as kerosene.]]>
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