Treatment of Used Motor Oil with Moringa stenopetala Seed Cake and Modified Natural Zeolite for Domestic Fuel. Bethel Nahusenay Medmim Addis Ababa University, 2018 Among the fraction from the refinery process of petroleum industry automotive and non-automotive lubricants oils are some of the products which can be recycled for its primarily purpose or as secondary use for energy resource after their primary purpose life cycle completed usually called as used motor oil. These oils gained significant attention due to the predicted depletion of conventional fuels availability in near future and environmental pollution concern. Utilization of used motor oil as a domestic fuel after treatment with Moringa stenopetal hexane extract seed cake powder and modified natural zeolite at various ratios and measured its heavy metal ion content by ICP-OES followed by mixing kerosene with modified natural zeolite treated used motor oil with 20% and 25% are one of the most promising options to replace conventional fossil fuel. Accordingly, the modified natural zeolite treated used motor oil with 20% and 25% of kerosene ratio observed that favorable physico-chemical characteristics such as viscosity, density, flashpoint and calorific value for domestic fuel. All the physico-chemical measurement shows decrease in enhancing the mixture for domestic fuel use. In addition to this preliminary treatment with Moringa stenopetala hexane extracts seed cake indicates that there is a decrease in viscosity value from 228 to 201,167 and 126 milli poise as the percentage value of Moringa stenopetala hexane extracts seed cake and used motor oil increase from 0%, to 10%, 20%, 30% and up to its saturation level of 40% respectively. However the calorific value of the mixture with kerosene decrease as the percentage of kerosene increased due to the dilution effect of kerosene because of the kerosene calorific value is less than that of used motor oil.