Abstract: A lubricating oil composition containing a base oil (A), a molybdenum-based friction modifier (B), a metal-based detergent (C), and a dispersant (D), in which the dispersant (D) contains a non-boron-modified polyisobutenyl succinic bisimide (D1). The IR spectrum of the non-boron-modified polyisobutenyl succinic bisimide (D1) is determined by an FT-IR method, having a ratio [Abs (1705 cm?1)/Abs (1390 cm?1)] of a peak intensity Abs (1705 cm?1) at 1705 cm?1 to a peak intensity Abs (1390 cm?1) at 1390 cm?1 is 7.5 or less. A content of the non-boron-modified polyisobutenyl succinic bisimide (D1) is 50 mass % or more based on a total amount of the dispersant (D), and contains a kinematic viscosity at 100° C. is 9.3 mm2/s or less. The lubricating oil composition has an excellent effect of reducing a friction coefficient while containing a molybdenum-based friction modifier and a succinimide compound.

Abstract: A lubricating oil composition may contain a base oil (A) and a dispersant-type viscosity index improver (B), in which the nitrogen atom content based on the solid content of the dispersant-type viscosity index improver (B) is 0.50 to 1.50% by mass, and the weight-average molecular weight (Mw) thereof is 100,000 or more, and the content in terms of the solid content based on the total amount of the composition of the dispersant-type viscosity index improver (B) is more than 0.05% by mass and less than 5.0% by mass. The lubricating oil composition may exert excellent wear resistance in a state contaminated with soot.

Abstract: A lubricating oil composition, containing a base oil (A), a metal-based detergent (B), and a molybdenum compound (D), the lubricating oil composition having a content of molybdenum atoms derived from the molybdenum compound (D) of 0.05% by mass or more, a base number of 4.0 mg KOH/g or more, and an HTHS viscosity at 150° C. of 1.3 mPa·s or more and less than 2.3 mPa·s.

Abstract: Provided are a lubricating oil composition used in a diesel engine equipped with a forced-induction compressor, containing a base oil (A) containing a poly-?-olefin (A1), and a viscosity index improver (B) having an SSI (shear stability index) of 20 or less, having a distillation amount of a light fraction of 496° C. or less in a gas chromatography distillation test of less than 80% by volume, having a high retention of the effect of suppressing the formation of deposits that may occur inside the compressor, and being capable of retaining a high efficiency of the compressor for a long period of time, in the use thereof in a diesel engine equipped with a forced-induction compressor having an outlet temperature of the compressor becoming a high temperature reaching 190° C. or more, and a method for using the lubricating oil composition.

Abstract: The present invention relates to a lubricating oil composition containing a base oil (A), a molybdenum dithiocarbamate (B), an ester-based ashless friction modifier (C), and a metal salicylate (D), wherein the content of a molybdenum atom derived from the molybdenum dithiocarbamate (B) is 650 ppm by mass or more on the basis of the whole amount of the lubricating oil composition; a content ratio [C/BMo] of the ester-based ashless friction modifier (C) to a molybdenum atom derived from the molybdenum dithiocarbamate (B) is 5.0 to 10 in terms of a mass ratio; the content of a salicylate soap group derived from the metal salicylate (D) is 0.50% by mass or more on the basis of the whole amount of the lubricating oil composition; and a kinematic viscosity at 100° C. is 4.0 mm2/s or more and less than 9.3 mm2/s, and a high-temperature high-shear viscosity at 150° C. is 1.7 mPa·s or more and less than 2.9 mPa·s.

Abstract: Provided are a lubricating oil composition used in a diesel engine equipped with a forced-induction compressor, containing a base oil (A) containing a poly-?-olefin (A1), and a viscosity index improver (B) having an SSI (shear stability index) of 20 or less, having a distillation amount of a light fraction of 496° C. or less in a gas chromatography distillation test of less than 80% by volume, having a high retention of the effect of suppressing the formation of deposits that may occur inside the compressor, and being capable of retaining a high efficiency of the compressor for a long period of time, in the use thereof in a diesel engine equipped with a forced-induction compressor having an outlet temperature of the compressor becoming a high temperature reaching 190° C. or more, and a method for using the lubricating oil composition.

Abstract: The present invention relates to a lubricating oil composition containing a base oil (A), a molybdenum dithiocarbamate (B), an ester-based ashless friction modifier (C), and a metal salicylate (D), wherein the content of a molybdenum atom derived from the molybdenum dithiocarbamate (B) is 650 ppm by mass or more on the basis of the whole amount of the lubricating oil composition; a content ratio [C/BMo] of the ester-based ashless friction modifier (C) to a molybdenum atom derived from the molybdenum dithiocarbamate (B) is 5.0 to 10 in terms of a mass ratio; the content of a salicylate soap group derived from the metal salicylate (D) is 0.50% by mass or more on the basis of the whole amount of the lubricating oil composition; and a kinematic viscosity at 100° C. is 4.0 mm2/s or more and less than 9.3 mm2/s, and a high-temperature high-shear viscosity at 150° C. is 1.7 mPa·s or more and less than 2.9 mPa·s.

Abstract: A solid lubrication roller bearing capable of stably transferring a lubricant from spacers and reducing wear of a solid lubrication film on the surfaces of rollers is provided. The solid lubrication roller bearing comprises a raceway member having two rolling surfaces, a plurality of rollers forming first members disposed between the rolling surfaces to carry a load and covered with a solid lubrication film, and spacers forming second members interposed between the rollers to hold intervals formed of a self-lubricating material and having a recessed surface in contact with the rollers. Metal balls with a hardness higher than that of the spacer forming third members with a diameter smaller than that of the rollers are interposed between the spacers in at least one position.

Abstract: In some preferred embodiments of the present invention, a long-life rolling element which prevents a solid lubrication film from being broken away near the roots is provided. In a rolling element coated with a solid lubrication film in the form of a molybdenum disulfide sputter film, the solid lubrication film 3 is divided into two layers, a boundary layer 3A corresponding to the boundary between the firm and a roller 2 and an upper layer 3B. The boundary layer 3B has an oxygen content of 5 to 30% in atomic concentration, and the upper layer 3B has an oxygen content of 3% or less in atomic concentration.