Shell Oil Comapny

Michael J Riley

Robert P Aiello

Leonard B Graiff

Kevin W Poindexter

Herbert D Millay

H Dale Millay

Intake valve deposits in port fuel injected engines are reduced by using a fuel containing a mixture of (a) an oil soluble polyamine selected from (i) an aliphatic alkylene polyamine containing at least one olefinic polymer chain attached to a nitrogen and/or carbon atom of the alkylene radical(s) connecting the amino nitrogen atoms and said polyamine having a number average molecular weight in the range of from about 600 to about 10,000, (ii) a Mannich polyamine comprising the condensation product of a high molecular weight sulfur-free alkyl-substituted hydroxyaromatic compound wherein the alkyl group has a number average molecular weight from about 600 to about 10,000, an amine which contains an amino group having at least one active hydrogen atom, and an aldehyde, wherein the respective molar ratio of reactants is 1:0.1-10:0.1-10, or (iii) mixtures of (i) and (ii) and (b) an oil soluble hydrocarbyl poly(oxyalkylene)aminocarbamate having a number average molecular weight in the range of from about 600 to about 10,000 having at least one basic nitrogen atom wherein the hydrocarbyl group contains from 1 to about 30 carbons atoms, and wherein the mixture is present in an amount of 5-1000 ppmw basis the fuel and the weight ratio of component (a) to component (b) ranges from about 3:1 to about 1:2. The fuels are also compatible with carburetor and throttle body injected engines.

Gasoline composition for reducing intake valve deposits in port fuel

Intake valve deposits in port fuel injected engines are reduced by using a mixture of (a) of about 2.5 ppmw or higher of basic nitrogen in the form of an oil-soluble aliphatic alkylene polyamine containing at least one olefinic polymer chain, said polyamine having a molecular weight of about 600 to about 10,000, and (b) from about 75 ppmw to about 125 ppmw based on the fuel composition of certain oil-soluble olefinic polymers, poly(oxyalkylene) alcohol, glycol or polyol or mono or di ether thereof, non-aromatic oils or polyalpha olefins. The fuels are also compatible with carburetor and throttle body injected engines.

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Houston, TX, United States of America

Michael J Riley