Abstract: A bis-type alkenyl-substituted succinimide which is prepared by reaction of succinic anhydride substituted with 2-alkenyl group having a branch structure in ?-position with alkylenepolyamine and its derivatives derived from the bis-type alkenyl-substituted succinimide by post-treatment are of value as friction modifiers, particularly for incorporation into lubricating oils for automatic transmissions.

Abstract: A lubricating oil composition containing a bis-type alkenyl-substituted succinimide which is prepared by reaction of succinic anhydride substituted with 2-alkenyl group having a branched structure in ?-position with alkylenepolyamine or a compound derived from the bis-type alkenyl-substituted succinimide by post-treatment in combination with a mixture of an overbased sulfonate having a C20-C24 alkyl group and an overbased salicylate having a C14-C18 alkyl group shows a high friction coefficient within a wide sliding velocity range and keeps its high anti-shudder performance for a long period of time.

Abstract: A bis-type alkenyl-substituted succinimide which is prepared by reaction of succinic anhydride substituted with 2-alkenyl group having a branch structure in ?-position with alkylenepolyamine and its derivatives derived from the bis-type alkenyl-substituted succinimide by post-treatment are of value as friction modifiers, particularly for incorporation into lubricating oils for automatic transmissions.

Abstract: There is provided a lubricating oil composition that has good friction performance and friction performance durability, and which is unlikely to cause degradation of oil seals made from fluororubbers, and which is particularly useful as an automatic transmission fluid. This lubricating oil composition is produced by adding a phosphorus/nitrogen-containing ashless dispersant of 0.2 to 8 wt % with a nitrogen/phosphorus ratio of 1.5 to 2.8, a friction modifier of 0.01 to 5 wt %, a metal-containing detergent of 0.005 to 2 wt %, and an antioxidant of 0.1 to 5 wt % as additives to a base oil with a lubricating viscosity.

Abstract: An additive compound comprising a non-borated and/or borated reaction product, in which the reaction product is obtained by reacting a linear or branched, saturated or unsaturated monovalent aliphatic acid having 8 to 22 carbon atoms, urea, and polyalkylenepolyamine, when employed in a lubricating oil composition is favorably employable as an automatic transmission fluid of internal combustion engines.

Abstract: The present invention relates to a lubricating oil composition comprising a major amount of base oil of lubricating viscosity and the following additives in the following amounts based on a total amount of the lubricating oil composition: (A) 0.1 to 10 wt.% of a succinic acid ester, (B) 0.01 to 2 wt.% of a phosphorous acid ester, (C) 0.1 to 5 wt.% of an amide compound which is a reaction product obtained by reaction of a linear or branched, saturated or unsaturated monovalent aliphatic acid having 8 to 22 carbon atoms, urea, and polyalkylenepolyamine, (D) 0.0 1 to 2 wt.% of an overbased metal containing detergent, and (E) 0.01 to 1 wt.% of a corrosion inhibitor.

Abstract: An additive compound comprising a non-borated and/or borated reaction product, in which the reaction product is obtained by reacting a linear or branched, saturated or unsaturated monovalent aliphatic acid having 8 to 22 carbon atoms, urea, and polyalkylenepolyamine, when employed in a lubricating oil composition is favorably employable as an automatic transmission fluid of internal combustion engines.

Abstract: A lubricating oil composition comprising a zinc dithiophosphate and a zinc saturated aliphatic monocarboxylate dissolved in a base oil, wherein the zinc dithiophosphate and zinc saturated aliphatic monocarboxylate are in the ratio of equivalents from 6:1 to 45:1.

Abstract: A biodegradable multipurpose functional fluid for agricultural or construction machinery, comprising a base oil, a detergent-dispersant and an antioxidant (and a viscosity index improver if desired), in which the base oil is a fatty acid triester of trimethylolpropane obtained from a fatty acid that either has from 40% to 70% by weight of caprylic acid and from 20% to 50% by weight of capric acid, or is derived from a coconut oil which has been adjusted to have a stearic acid content of from 10% to 20% by weight.

Abstract: A method of preparing an overbased lubricating oil additive comprising introducing carbon dioxide into a mixture containing (1) an oil-soluble organic acid or a metal salt thereof, which acid or salt includes a hydrocarbon group having 8 to 150 carbon atoms, and (2) an alkaline earth metal compound selected from the group consisting of oxides or hydroxides of alkaline earth metals, at a temperature of higher than about 100.degree. C, in a reaction medium of a lubricating oil, in the presence of a reaction accelerator comprising a dihydric alcohol, a phenol compound and elemental sulfur, thereby to effect complete carbonation; and thereafter removing all of the volatile components contained in the reaction product.