The aim of this study is to obtain pyrolysis liquid products from waste engine oil in the presence of wood ash. Petroleum-based waste engine oil can be converted into reusable products such as gasoline and diesel fuel. Possible acceptable processes are distillation, cracking, and pyrolysis. Distillation technique is one of the cheapest and most efficient processes experienced in recycling of waste engine oils. The aims of waste engine oil processing are upgrading via recycling and re-refining processes of the petroleum-based wastes by converting them into reusable products such as gasoline and heavy oil. The pyrolysis liquid products of waste engine oil can be used as alternative engine fuel. The highest yield of liquid product was 84.7%, which can be obtained from the pyrolysis with 15% wood ash run.