Abstract: A process which makes use of waste automotive lubricating oils as an energy source, and function as an emulsifier, into which oils are embodied, and agitated, aqueous solutions of water-soluble salts of those metals which inhibit corrosion and minimize deposits when fuel oils are burned. The resultant fuel oil additive, as a water-in-oil emulsion, is introduced into fuels which contain corrosives, prior to combustion in boilers, gas turbines, or diesel engines. Upon combustion, the inhibiting metals from the additive combine with the corrosives in the fuel to form innocuous compounds.