Motor fuel additive composition

An additive composition for use in leaded motor fuel which reduces and modifies both fuel intake system and combustion chamber deposit formation for the purpose of reducing engine octane requirement increase and allows the use of lower levels of alkyl lead while retaining engine performance comprising a mixture of:

• (a) a fuel conditioner component having;
• (i) from about 2 to about 50 weight percent, based upon the total weight of the fuel conditioner component, of a polar oxygenated hydrocarbon having an average molecular weight in the range of about 200 to about 500, an acid number in the range of about 25 to about 175, and a saponification number in the range of about 30 to about 250;
• and (ii) from about 2 to about 50 weight percent, based upon the total weight of the fuel conditioner component, of an oxygenated compatibilizing agent preferably having a solubility parameter in the range of about 7.0 to about 14.0 and moderate to strong hydrogen capacity;
• (b)an alkyl lead compound;
• (c) a lead scavenger compound;
• and (d) a detergent compound.

A leaded motor fuel additive composition which reduces and modifies both fuel intake system and combustion chamber deposit formation for the purpose of reducing engine octane requirement increase and allows the use of lower levels of alkyl lead while retaining engine performance comprising a mixture of:

• (a) from about 5 to about 50 weight percent, based upon the total weight of components a and b, of a detergent component selected from the group consisting of (i) a reaction product of:
• (A) a substituted hydrocarbon of the formula
• R1—X (I)
• wherein R1 is a hydrocarbyl radical having a molecular weight in the range of about 150 to about 10,000, and X is selected from the group consisting of halogens, succinic anhydride and succinic dibasic acid, and(B)an amino compound of the formula
• H—(NH-(A)m)n)-Y—R2 (II)
• wherein Y is O or NR5, R5 being H or a hydrocarbyl radical having 1-30 carbon atoms;
• A is a straight chain or branched chain alkylene radical having 1-30 carbon atoms;
• A is straight-chain or a branched-chain alkylene radical having 1-30 carbon atoms, m has a value in the range of 1-15;
• n has a value in the range of 0-6;
• and R2 is selected from the group consisting of H, a hydrocarbyl radical having a molecular weight in the range of about 15 to about 10,000, and a homopolymeric or heteropolymeric polyoxyalkylene radical of the formula
• R3-((Q)a(T)b(Z)c)d- (III)
• wherein R3 is H or a hydrocarbyl radical having 1-30 carbon atoms, Q, T, and Z are polyoxyalkylene moieties having 1-6 carbon atoms, a, b and c each have values ranging from 0-30, and d has a value in the range of 1-50, and (ii) a polybutylamine or polyisobutylamine of the formula
• where R11 is a polybutyl or polyisobutyl radical derived from isobutene and up to 20% by weight of n-butene and R12 and R13 are identical or different and are each hydrogen, an aliphatic or aromatic hydrocarbon, a primary or secondary, aromatic or aliphatic aminoalkylene radical or polyaminoalkylene radical, a polyoxyalkylene radical or a heteroaryl or heterocyclyl radical, or, together with the nitrogen atom to which they are bonded, form a ring in which further hetero atoms may be present;
• (b) a fuel conditioner component comprising:
• (i) from about 2 to about 50 weight percent, based upon the total weight components a and b, of a polar oxygenated hydrocarbon having an average molecular weight in the range of about 200 to about 500, an acid number in the range of about 25 to about 175, and a saponification number in the range of about 30 to about 250, and (ii) from about 2 to about 50 weight percent, based upon the total of components a and b, of an oxygenated compatibilizing agent preferably having a solubility parameter in the range of about 7.0 to about 14.0 and moderate to strong hydrogen capacity;
• (c) an alkyl lead compound;
• and (d) a lead scavenger compound.