The technical, economic and environmental impact of using waste automotive lubricating oils to improve the municipal incineration combustion process was examined. Laboratory analyses of selected physical properties of waste oil and a waste oil burner testing program were conducted to complement an information search program. The physical and chemical properties of waste oil were reviewed in relation to its suitability as a fuel oil. The auxiliary fuel heat flux requirements to offset the adverse effects of wet refuse were estimated utilizing a combustion model of a refuse bed. The impact on air quality from the combustion of waste oil in a municipal incinerator was estimated. Three-month average ground level concentrations for lead were calculated and presented as concentration isopleths. Capital Investment and operating costs were developed for auxiliary waste oil systems in conjunction with muncipal inceinerators. (Modified author abstract)