A fuel for internal combustion engines comprises hydrocarbons in the gasoline boiling range containing a minor proportion of a tetra alkyl lead and a minor proporton of a mixture of a halohydrocarbon scavenger and up to 0.4 theories of a triester of orthophosphoric or phosphorous acid, this ester containing at least one aryl radical attached through an oxygen atom to the phosphorus atom, which aryl radical may be substituted by alkyl groups of 1 to 3 carbon atoms, and the ratio of theories of halohydrocarbon scavenger to theories of said triester lying between 3 : 2 and 15 : 1. The halohydrocarbon scavenger may be ethylene dichloride or dibromide, acetylene tetrabromide, hexachloropropylene or the mono- or poly halo propanes, butanes, pentanes or alkyl benzenes. More than one such compound may be employed. The triester may be tri-o-cresyl orthophosphate, tricumenyl orthophosphate, propyl di-p-cresyl phosphite, triphenyl phosphite or tri-p-cresyl phosphite. The total amount of scavengers is generally between 0.4 and 2 theories based on the lead present, and preferably between 0.9 and 1.2 theories. The triester of orthophosphoric or phosphorous acid is preferably present in an amount between 0.1 and 0.3 theories. The fuels may also contain corrosion or oxidation inhibitors, such as 2.4-dimethyl-6-t-butyl phenol and other alkyl phenols, N:N1-dibutyl-p-phenylene diamine, hydroquinone and phenyl-alpha-naphthylamine, and dyes. The Specification also describes compositions for adding to gasolines, comprising the mixtures of the two scavengers and tetra alkyl lead.
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