A gear fluid composition for lubricating a driveline including a thiadiazole additive and select substituted aryl-phosphite compounds to achieve good antiwear and copper corrosion performance.

A gear fluid composition for lubricating a driveline including a thiadiazole additive and select substituted aryl-phosphite compounds to achieve good antiwear and copper corrosion performance.

The disclosed technology relates to the use of toxicologically acceptable hydrocarbyl- (e.g. alkyl-) phenol detergents and their salts in automotive lubricating oils, such as, for example, automatic or manual transmissions.

The disclosed technology relates to the use of toxicologically acceptable hydrocarbyl- (e.g. alkyl-) phenol detergents and their salts in automotive lubricating oils, such as, for example, automatic or manual transmissions.

(1) A cylinder lubricating oil composition for a crosshead diesel engine, the composition having a sulfated ash content of 2.0 to 5.5 mass %; a base number of 15 to 45 mgKOH/g; and an autoignition temperature of no less than 262? C. (2) A cylinder lubricating oil composition for a crosshead diesel engine, comprising: a lubricant base oil; (B) a Ca sulfonate detergent having a base number of no less than 10 mgKOH/g and less than 60 mgKOH/g; (C) a Ca phenate detergent having a base number of 55 to 200 mgKOH/g; (D) an amine antioxidant; and (E) a zinc dithiophosphate, wherein the composition has a base number of no less than 15 mgKOH/g and less than 120 mgKOH/g.

The present invention provides a lubricating oil composition comprising: a lubricating base oil; 1.0% by mass or more and 15.0% by mass or less of a dispersant poly(meth)acrylate compound having the weight average molecular weight of 20000 or more and 200000 or less; 0.05% by mass or more and 6.0% by mass or less of a thiadiazole compound; 1.5% by mass or more and 4.0% by mass or less of a polysulfide compound; and 0.2% by mass or more and 1.5% by mass or less of a friction modifier, based on the total amount of the lubricating oil composition, wherein the mass ratio of the polysulfide compound content to the thiadiazole compound content (polysulfide compound/thiadiazole compound) is 0.4 or more and 50 or less, and the kinematic viscosity at 100 C. of the lubricating oil composition is 7.0 mm.sup.2/s or more and 35.0 mm.sup.2/s or less.

The present invention provides a lubricating oil composition comprising: a lubricating base oil; 1.0% by mass or more and 15.0% by mass or less of a dispersant poly(meth)acrylate compound having the weight average molecular weight of 20000 or more and 200000 or less; 0.05% by mass or more and 6.0% by mass or less of a thiadiazole compound; 1.5% by mass or more and 4.0% by mass or less of a polysulfide compound; and 0.2% by mass or more and 1.5% by mass or less of a friction modifier, based on the total amount of the lubricating oil composition, wherein the mass ratio of the polysulfide compound content to the thiadiazole compound content (polysulfide compound/thiadiazole compound) is 0.4 or more and 50 or less, and the kinematic viscosity at 100 C. of the lubricating oil composition is 7.0 mm.sup.2/s or more and 35.0 mm.sup.2/s or less.

The present invention relates to new additive mixtures, processes for the production thereof and the use thereof for turbine oils.

The present invention relates to new additive mixtures, processes for the production thereof and the use thereof for turbine oils.

A problem is to provide a heat treating oil composition containing a sulfur compound that is excellent in brightness of a metal material after a heat treatment, such as quenching, and in storage stability. The problem is solved by a heat treating oil composition containing one or more kinds of base oils (A) selected from the group consisting of a mineral oil (A1), a synthetic oil (A2), and a vegetable oil (A3), and a sulfur compound (B), the sulfur compound (B) containing one or more kinds selected from the group consisting of a particular sulfide compound (B1), a particular sulfide compound (B2), and a particular thiazole compound (B3).