Abstract: Diesel fuels which have good ignition qualities, good combustion emission performance and good low temperature characteristics are characterized by a cetane number of at least 45, a total aromatics content of 10 to 15 wt. pct., a polynuclear aromatics content of less than 11 wt. pct., a sulfur content of not more than 50 ppmw, a total nitrogen content (from all sources) of not more than 100 ppmw, and excellent low temperature flow properties as manifested by a pour point not higher than -12.degree. C. and a cloud point not higher than -10.degree. C.

Abstract: Polymeric amine sulfur-containing heterocyclic reaction products have been found to be effective antiwear and corrosion inhibiting additives for fuels, including gasolines, and lubricants with excellent high temperature decomposing, cleanliness and detergency/dispersancy features.

Abstract: Polyalkylene amine coupled carboxylates are effective multifunctional additives, providing cleanliness to fuels and lubricants as well as friction-reducing and corrosion-inhibiting properties.

Abstract: Polyalkylene amine coupled heterocyclic compounds are effective multifunctional additives, providing cleanliness to fuels and lubricants as well as anti-wear, friction-modifying, thermal and oxidative stabilizing properties. The beneficial effects of the product of the instant invention apparently result from an internal synergism between the polyalkylene amine groups and the heterocyclic groups.

Abstract: Polyalkylene amine coupled heterocyclic compounds are effective multifunctional additives, providing cleanliness to fuels and lubricants as well as anti-wear, friction-modifying, thermal and oxidative stabilizing properties. The beneficial effects of the product of the instant invention apparently result from an internal synergism between the polyalkylene amine groups and the heterocyclic groups.

Abstract: Cloud point, pour point and filterability of diesel and heating fuels are improved by the incorporation of minor amounts of an additive prepared from the reaction products of a long chain oligomeric alkylsuccinic anhydride, a higher alkyl linear saturated alcohol and a tertiary amino substituted polyol.

Abstract: The incorporation of minor amounts of an additive prepared from the reaction products of a long chain oligomeric alkylsuccinic anhydride or the corresponding acid, a mono or polyfunctional epoxide and a long chain secondary amine provide improved cloud point, pour point and filterability for diesel and heating fuels.

Abstract: The product of reaction between a branched chain monocarboxylic acid amide, an epoxide and a carboxylic acid when added to a hydrocarbyl distillate fuel in minor effective amounts provides a fuel composition having improved cold flowability.

Abstract: A reaction product or additive compound comprising an ester derivative of a branched chain monocarboxylic acid, wherein said ester derivative has at least one tertiary amine group and at least one ester group. The additive compound when added to a hydrocarbyl distillate fuel in a cold flow improving effective amount produces a fuel composition having improved cold flowability.

Abstract: The product of reaction between an ester derivative of a branched chain monocarboxylic acid, having at least one tertiary amine group, an epoxide and an additional carboxylic acid when added to a hydrocarbyl distillate fuel in minor effective amounts provides a fuel composition having improved cold flowability.