Amoco Corporation

Ethyl Petroleum Additives, Inc.

Paula R Vettel

David J Fenoglio

Francis J Slama

David W Eggerding

Dispersancy and fluoroelastomer seal compatibility are achieved by use in the lubricant of a dispersing amount of a product made by reacting aminoguanidine or a basic salt thereof with a hydrocarbyl-substituted succinic acid or anhydride in a mole ratio of from about 0.4 to about 1.2 moles of the aminoguanidine or basic salt thereof per mole of the succinic acid or anhydride compound.

Fluoroelastomer-friendly crankcase and drivetrain lubricants and their

A dispersant composition having improved compatibility with fluorohydrocarbon-containing elastomeric engine seals, said dispersant composition comprising the reaction product obtained by reacting a C.sub.30 -C.sub.250 hydrocarbyl-substituted succinic anhydride with aminoguanidine, or a basic salt thereof, at a reaction temperature of from about 155.degree. C. to about 200.degree. C.

Method for preparing engine seal compatible dispersant for lubricating

A dispersant composition comprising the reaction product of an ashless dispersant selected from the group consisting of (i) Mannich dispersants, (ii) succinimide dispersants, (iii) succinate ester-amide dispersants, and (iv) polymeric viscosity index improvers having amine dispersant character, with an inorganic mineral acid selected from the group consisting of sulfuric, nitric and hydrochloric acids.

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Downers Grove, IL, United States of America

Paula R Vettel