LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINES
First Claim
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1. A lubricating oil composition for internal combustion engines comprising:
- (A) a base oil mixture comprising at least two base oils in different API (American Petroleum Institute) categories, the base oil mixture having a sulphur content of from 0.14 to 0.7 mass %, % CA in accordance with ASTM D3238 of from 0.9 to 5.0, and % CP in accordance with ASTM D3238 of 60 or more, and(B) a monoglyceride with a hydrocarbon group having from 8 to 22 carbon atoms (a glycerine fatty acid ester with the fatty acid ester bonded to one of the three hydroxyl groups of the glycerine), wherein the monoglyceride has a hydroxyl value of from 150 to 300 mgKOH/g and is present at a level of from 0.3 to 2.0 mass % based on the total mass of the composition.
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Abstract
A lubricating oil composition for internal combustion engines containing a base oil mixture with specific properties and a monoglyceride with a specific structure. The lubricating oil composition of the present 5 invention, as well as providing outstanding wear resistance and fuel economy, causes condensed water etc. from water vapour produced as a result of fuel combustion to be dispersed in the oil, so preventing corrosion or rusting of the engine.
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Citations
21 Claims
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1. A lubricating oil composition for internal combustion engines comprising:
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(A) a base oil mixture comprising at least two base oils in different API (American Petroleum Institute) categories, the base oil mixture having a sulphur content of from 0.14 to 0.7 mass %, % CA in accordance with ASTM D3238 of from 0.9 to 5.0, and % CP in accordance with ASTM D3238 of 60 or more, and (B) a monoglyceride with a hydrocarbon group having from 8 to 22 carbon atoms (a glycerine fatty acid ester with the fatty acid ester bonded to one of the three hydroxyl groups of the glycerine), wherein the monoglyceride has a hydroxyl value of from 150 to 300 mgKOH/g and is present at a level of from 0.3 to 2.0 mass % based on the total mass of the composition. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10, 11)
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5. (canceled)
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12. A method comprising lubricating an internal combustion engine with a lubricating oil composition that comprises:
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(A) a base oil mixture comprising at least two base oils in different API (American Petroleum Institute) categories, the base oil mixture having a sulphur content of from 0.14 to 0.7 mass %, % CA in accordance with ASTM D3238 of from 0.9 to 5.0, and % CP in accordance with ASTM D3238 of 60 or more, and (B) a monoglyceride with a hydrocarbon group having from 8 to 22 carbon atoms (a glycerine fatty acid ester with the fatty acid ester bonded to one of the three hydroxyl groups of the glycerine), wherein the monoglyceride has a hydroxyl value of from 150 to 300 mgKOH/g and is present at a level of from 0.3 to 2.0 mass % based on the total mass of the composition, and wherein the internal combustion engine uses a fuel with H/C ratios of from 1.93 to 4, is fitted with idle-stop equipment, or uses a fuel incorporating a biofuel or a biodiesel. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification