JP2012057166A5 - - Google Patents

Claims (12)

At least the following components a) to d) are dissolved or dispersed in a base oil having a sulfur content of 0.1% by mass or less, and the amount of sulfated ash is 0.1 to 1.1% by mass, containing phosphorus. The amount is in the range of 0.01 to 0.12 mass%, the sulfur content is in the range of 0.01 to 0.5 mass%, and the chlorine content is 150 ppm or less, and the sulfur content is 0.005 mass% or less. Lubricating oil composition for the lubrication of gasoline or gas engines operated with fuel:
a) An ashless dispersant that is an alkenyl or alkyl succinimide or a derivative thereof is 0.01 to 0.3% by mass in terms of nitrogen content,
b) An alkyl salicylic acid calcium salt detergent having a sulfur content of 3% by mass or less and a total base number of 10 to 350 mg KOH / g is 0.1 to 1% by mass in terms of sulfated ash, provided that the alkyl salicylic acid calcium salt is purified. The organic acid metal salt contained in the agent is present in the composition in an amount of 0.2 to 7% by mass, and the alkyl salicylic acid calcium salt detergent is a non-sulfurized alkyl having an alkyl group having 14 to 18 carbon atoms. A mixture of a calcium salicylic acid detergent and a non-sulfurized alkyl salicylic acid calcium salt detergent having an alkyl group with 20 to 28 carbon atoms,
c) a zinc phosphate antiwear agent selected from the group consisting of zinc dialkyldithiophosphate and zinc dihydrocarbyl phosphate is 0.01 to 0.12% by mass in terms of phosphorus content, and d) antioxidant phenol 0.01 to 5% by mass of an antioxidant selected from the group consisting of a compound and an antioxidant amine compound,
However, the above-mentioned sulfated ash content, phosphorus content, sulfur content, and mass% of components a) to d) are values based on the total mass of the composition.   The lubricating oil composition according to claim 1, wherein the total base number of the alkyl salicylic acid calcium salt detergent of component b) is in the range of 30 to 300 mg KOH / g.   The lubricating oil composition according to claim 1, wherein the total base number of the non-sulfurized alkylsalicylic acid calcium salt detergent having an alkyl group having 14 to 18 carbon atoms is in the range of 100 to 250 mgKOH / g.   The lubricating oil composition according to claim 1, wherein the total base number of the non-sulfurized alkylsalicylic acid calcium salt detergent having an alkyl group having 20 to 28 carbon atoms is in the range of 280 to 350 mgKOH / g.   The calcium salicylic acid calcium salt detergent is a non-sulfurized alkyl salicylic acid calcium salt detergent having an alkyl group having 14 to 18 carbon atoms and a non-sulfurized alkyl salicylic acid having an alkyl group having 20 to 28 carbon atoms. The lubricating oil composition according to claim 1, wherein the lubricating oil composition is a mixture having a calcium amount ratio of 2: 8 to 8: 2 with the calcium salt detergent.   The calcium salicylic acid calcium salt detergent is a non-sulfurized alkyl salicylic acid calcium salt detergent having an alkyl group having 14 to 18 carbon atoms and a non-sulfurized alkyl salicylic acid having an alkyl group having 20 to 28 carbon atoms. The lubricating oil composition according to claim 1, which is a mixture of an organic acid metal salt amount ratio of 4: 6 to 8: 2 with a calcium salt detergent.   The ashless dispersant of component a) is obtained by reacting polybutenyl succinic anhydride with polyamine obtained by a thermal reaction method using polybutene and maleic anhydride as raw materials and without contacting chlorine or a chlorine-containing compound. The lubricating oil composition according to claim 1, which is succinimide or a derivative thereof.   Furthermore, the lubricating oil composition of Claim 1 which contains a molybdenum containing compound 0.01-5 mass%.   The lubricating oil composition according to claim 1, wherein the total base number is in the range of 1 to 17 mg KOH / g.   The lubricating oil composition according to claim 1, which is a 0W5, 0W10, 0W15, 0W20, 0W30, 5W20, 5W30, 10W20, or 10W30 multigrade engine oil containing a viscosity index improver. The lubricating oil composition according to claim 1 sulfur is for lubricating a gasoline engine or a gas engine is operated using the following fuels 0.005 wt% to be mounted on a vehicle for land travel. Method using a lubricating oil composition according to claim 1, operating the gasoline engine or a gas engine sulfur is mounted on a vehicle for land travel which is operated using a 0.005 wt% or less of the fuel.