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US 10,781,395 B2Granted
Lubricant composition for gasoline engine and method for producing same
AssigneeIdemitsu Kosan Co., Ltd.
InventorKazushi Tamura
Life of this patent
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Abstract
Provided is a lubricating oil composition having excellent detergency and LSPI preventing performance, and specifically a lubricating oil composition including a base oil, a calcium detergent, and a magnesium detergent and/or a sodium detergent, wherein the content of the calcium detergent as converted into a calcium atom and a mass ratio of a magnesium atom (Mg) contained in the magnesium detergent and/or a sodium atom (Na) contained in the sodium detergent to a calcium atom (Ca) [(Mg and/or Na)/Ca] fall within the specific ranges.
Claims12
A method, comprising lubricating a gasoline engine using a lubricating oil composition comprising:
- a base oil;
- a calcium salicylate;
- a magnesium sulfonate;
- a boron-containing succinimide;
- and optionally a non-borated succinimide,
- wherein:
- at least 220 ppm by mass of boron from the boron-containing succinimide is present;
- a content of the base oil is 70 mass % or more based on a whole amount of the composition;
- the calcium salicylate is the only calcium detergent present in the lubricating oil composition and a content of the calcium salicylate as converted into a calcium atom content is 800 to less than 2,000 ppm by mass based on the whole amount of the composition;
- the magnesium sulfonate is the only magnesium detergent present in the lubricating oil composition and a content of the magnesium sulfonate as converted to a magnesium atom content is 100 to 1,500 ppm by mass based on the whole amount of the composition;
- a mass ratio of the magnesium atom content, to the calcium atom content is 0.05 to 1.00;
- a content of nitrogen in the lubricating oil composition is less than 0.16 mass %;
- the lubricating oil composition has a kinematic viscosity at 100° C. of 3.8 to 12.5 mm2/s;
- wherein a maximum value of a heat flow of the lubricating oil composition is 325.5 mW or less, based on an amount of heat flow that occurs following a temperature rise from ambient temperature to 400° C. at a rate of 10° C./min, when 5 mg of the lubricating oil composition is applied to an aluminum pan, and a high-pressure differential scanning calorimeter is used to measure the heat flow at an air pressure of 10 atm;
- and
- a score of the hot tube test at 300° C. of the lubricating oil composition measured based on JPI-5S-55-99 is 7 or more.
13 more elements
A lubricating oil composition, comprising
- a base oil;
- a calcium salicylate;
- a magnesium sulfonate;
- a boron-containing succinimide;
- and optionally a non-borated succinimide,
- wherein:
- at least 220 ppm by mass of boron from the boron-containing succinimide is present;
- a content of the base oil is 70 mass % or more based on a whole amount of the composition;
- the calcium salicylate is the only calcium detergent present in the lubricating oil composition and a content of the calcium salicylate as converted into a calcium atom content is 800 to less than 2,000 ppm by mass based on the whole amount of the composition;
- the magnesium sulfonate is the only magnesium detergent present in the lubricating oil composition and a content of the magnesium sulfonate as converted to a magnesium atom content is 100 to 1,500 ppm by mass based on the whole amount of the composition;
- a mass ratio of the magnesium atom content, to the calcium atom content is 0.05 to 1.00;
- a content of nitrogen in the lubricating oil composition is less than 0.16 mass %;
- the lubricating oil composition has a kinematic viscosity at 100° C. of 3.8 to 12.5 mm2/s;
- a total content of non-borated succinimide and boron-containing succinimide, as converted into a nitrogen atom, is less than 0.07 mass %;
- wherein a maximum value of a heat flow of the lubricating oil composition is 325.5 mW or less, based on an amount of heat flow that occurs following a temperature rise from ambient temperature to 400° C. at a rate of 10° C./min, when 5 mg of the lubricating oil composition is applied to an aluminum pan, and a high-pressure differential scanning calorimeter is used to measure the heat flow at an air pressure of 10 atm;
- and
- a score of the hot tube test at 300° C. of the lubricating oil composition measured based on JPI-5S-55-99 is 7 or more.
14 more elements
Dependencies are inferred from the claim text.