Abstract: A lubricating oil composition which can reduce the occurrence frequency of LSPI and which can ensure detergency. The lubricating oil composition which includes a lubricant base oil, a compound having calcium and/or magnesium, a compound having molybdenum and/or phosphorus, and an ashless dispersant having nitrogen and which satisfies X??0.85 and Y?0.18 (wherein X is calculated according to formula (1): X=([Ca]+0.5[Mg])×8?[Mo]×8?[P]×30 and Y is calculated according to formula (2): Y=[Ca]+1.65[Mg]+[N]). The lubricating oil composition for use in an internal combustion engine, more particularly, a lubricating oil composition for use in a supercharged gasoline engine.

Abstract: A lubricating oil composition which can reduce the occurrence frequency of LSPI and which can ensure detergency. The lubricating oil composition which includes a lubricant base oil, a compound having calcium and/or magnesium, a compound having molybdenum and/or phosphorus, and an ashless dispersant having nitrogen and which satisfies X??0.85 and Y?0.18 (wherein X is calculated according to formula (1): X=([Ca]+0.5[Mg])×8?[Mo]×8?[P]×30 and Y is calculated according to formula (2): Y=[Ca]+1.65[Mg]+[N]). The lubricating oil composition for use in an internal combustion engine, more particularly, a lubricating oil composition for use in a supercharged gasoline engine.

Abstract: The invention provides a lubricant oil composition useful for reduction in friction loss and improvement in fuel economy in internal combustion engines, particularly, a lubricant oil composition for internal combustion engines exhibiting an excellent friction reducing effect even in a diesel engine equipped with EGR accompanied with an increase in soot content in oil. The invention is a lubricant composition for internal combustion engines comprising a lubricant base oil consisting of a mineral oil and/or synthetic oil or the like incorporated with 1 wt % or more, based on the total weight of the lubricant oil composition, a nonionic surfactant with alkylene oxide added thereto consisting of at least one compound having an HLB value of 15 or more and a molecular weight of 900 or more, and a friction reducing method for internal combustion engines using this lubricant oil composition.

Abstract: The invention provides a lubricant oil composition useful for reduction in friction loss and improvement in fuel economy in internal combustion engines, particularly, a lubricant oil composition for internal combustion engines exhibiting an excellent friction reducing effect even in a diesel engine equipped with EGR accompanied with an increase in soot content in oil. The invention is a lubricant composition for internal combustion engines comprising a lubricant base oil consisting of a mineral oil and/or synthetic oil or the like incorporated with 1 wt % or more, based on the total weight of the lubricant oil composition, a nonionic surfactant with alkylene oxide added thereto consisting of at least one compound having an HLB value of 15 or more and a molecular weight of 900 or more, and a friction reducing method for internal combustion engines using this lubricant oil composition.