Abstract: A lubricating oil composition includes at least one base oil selected from the group consisting of a mineral oil-based lubricating oil, a synthetic oil-based lubricating oil, and a mixed oil thereof, zinc dialkyldithiophosphate X represented by Formula (1), and an acid phosphate ester amine salt Y represented by Formula (2), in which a content PX of the X is from 0.06% by mass to 0.08% by mass in terms of phosphorus concentration with respect to a total mass of the lubricating oil composition, and a content PY of the Y is from 0.015% by mass to 0.025% by mass in terms of phosphorus concentration with respect to the total mass of the lubricating oil composition.

Abstract: A lubricating oil composition includes at least one base oil selected from the group consisting of a mineral oil-based lubricating oil, a synthetic oil-based lubricating oil, and a mixed oil thereof, zinc dialkyldithiophosphate X represented by Formula (1), and an acid phosphate ester amine salt Y represented by Formula (2), in which a content PX of the X is from 0.06% by mass to 0.08% by mass in terms of phosphorus concentration with respect to a total mass of the lubricating oil composition, and a content PY of the Y is from 0.015% by mass to 0.025% by mass in terms of phosphorus concentration with respect to the total mass of the lubricating oil composition.

Abstract: A lubricating oil composition including: at least one base oil selected from a mineral oil-based lubricating oil, a synthetic oil-based lubricating oil, or a mixed oil thereof, and zinc dialkyldithiophosphates X consisting of the compounds Z1 to Z3 represented by the formulae (1) to (3) are contained, in which a total content of the zinc dialkyldithiophosphates X is 0.02% by mass or more in terms of phosphorus concentration with respect to the total mass of the oil composition, and the zinc dialkyldithiophosphates X satisfy the formulae (a) to (c). In the formula (1), each of R1 to R4 independently represents a linear or branched primary alkyl group having from 10 to 20 carbon atoms. In the formula (2), each of R5 to R8 independently represents a linear or branched primary alkyl group having from 7 to 9 carbon atoms. In the formula (3), each of R9 to R12 independently represents a linear or branched primary or secondary alkyl group having from 3 to 6 carbon atoms.

Abstract: A lubricating oil composition including: at least one base oil selected from a mineral oil-based lubricating oil, a synthetic oil-based lubricating oil, or a mixed oil thereof, and zinc dialkyldithiophosphates X consisting of the compounds Z1 to Z3 represented by the formulae (1) to (3) are contained, in which a total content of the zinc dialkyldithiophosphates X is 0.02% by mass or more in terms of phosphorus concentration with respect to the total mass of the oil composition, and the zinc dialkyldithiophosphates X satisfy the formulae (a) to (c). In the formula (1), each of R1 to R4 independently represents a linear or branched primary alkyl group having from 10 to 20 carbon atoms. In the formula (2), each of R5 to R8 independently represents a linear or branched primary alkyl group having from 7 to 9 carbon atoms. In the formula (3), each of R9 to R12 independently represents a linear or branched primary or secondary alkyl group having from 3 to 6 carbon atoms.

Abstract: An engine oil composition includes a star polymer (A) and a poly(alkyl (meth)acrylate) (B) as a viscosity index improver, and has a viscosity index of 185 to 230, the star polymer (A) having a star structure and having a weight average molecular weight of 100,000 to 1,000,000, the star structure being a structure in which polymer chains branch from a center of the polymer, the polymer chains being obtained by copolymerization and hydrogenation of an aromatic vinyl compound monomer and a conjugated diene monomer, the poly(alkyl (meth)acrylate) (B) having a weight average molecular weight of 200,000 to 600,000, the content (MA) of the star polymer (A) in the engine oil composition being 0.10 to 2.00 mass % based on the total mass of the engine oil composition, the content (MB) of the poly(alkyl (meth)acrylate) (B) in the engine oil composition being 0.50 to 6.00 mass % based on the total mass of the engine oil composition, and the ratio “MA/MB” being 0.10 to 1.00.

Abstract: An engine oil composition includes a star polymer (A) and a poly(alkyl (meth)acrylate) (B) as a viscosity index improver, and has a viscosity index of 185 to 230, the star polymer (A) having a star structure and having a weight average molecular weight of 100,000 to 1,000,000, the star structure being a structure in which polymer chains branch from a center of the polymer, the polymer chains being obtained by copolymerization and hydrogenation of an aromatic vinyl compound monomer and a conjugated diene monomer, the poly(alkyl (meth)acrylate) (B) having a weight average molecular weight of 200,000 to 600,000, the content (MA) of the star polymer (A) in the engine oil composition being 0.10 to 2.00 mass % based on the total mass of the engine oil composition, the content (MB) of the poly(alkyl (meth)acrylate) (B) in the engine oil composition being 0.50 to 6.00 mass % based on the total mass of the engine oil composition, and the ratio “MA/MB” being 0.10 to 1.00.

Abstract: From the facsimile apparatus of an advertiser, facsimile registration information indicating registrant ID, category ID, and advertisement contents is received. Image data of the advertisement contents are into advertiser-dedicated page data corresponding to registrant ID and category ID. From a subscriber-side processing apparatus to an advertisement service/management processing apparatus, a sending request for the advertisement contents stored in the advertiser-dedicated page data is sent. The requested advertisement contents are read from the advertiser-dedicated page data. The advertisement contents are sent to the subscriber-side processing apparatus which is a request source. When the sent advertisement contents are received, the advertisement contents are outputted to an output device of the subscriber-side processing apparatus.