LUBRICATING OIL COMPOSITION AND METHOD FOR MANUFACTURING SAID LUBRICATING OIL COMPOSITION
First Claim
1. A lubricating oil composition comprising, together with a base oil,a viscosity index improver (A) comprising a comb-shaped polymer (A1),a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, anda friction modifier (C) comprising a molybdenum-containing friction modifier,wherein a total content of an alkali metal atom and an alkaline earth metal atom is 2,000 mass ppm or less.
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Abstract
The lubricating oil composition of the present invention contains, together with a base oil, a viscosity index improver (A) including a comb-shaped polymer (A1), a detergent dispersant (B) including an alkali metal borate (B1) and an organometallic compound (B2) containing a metal atom selected from an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) including a molybdenum-containing friction modifier, with the total content of an alkali metal atom and an alkaline earth metal atom being 2,000 mass ppm or less. The lubricating oil composition of the present invention has excellent detergency, fuel saving properties, and LSPI-preventing properties.
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Citations
19 Claims
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1. A lubricating oil composition comprising, together with a base oil,
a viscosity index improver (A) comprising a comb-shaped polymer (A1), a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) comprising a molybdenum-containing friction modifier, wherein a total content of an alkali metal atom and an alkaline earth metal atom is 2,000 mass ppm or less.
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17. A lubricating oil composition comprising, together with a base oil,
a viscosity index improver (A) comprising a comb-shaped polymer (A1), a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) comprising a molybdenum-containing friction modifier, wherein a content of a calcium atom is 1,900 mass ppm or less.
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19. A method for producing a lubricating oil composition, comprising blending a base oil with
a viscosity index improver (A) comprising a comb-shaped polymer (A1), a detergent dispersant (B) comprising an alkali metal borate (B1) and an organometallic compound (B2) comprising a metal atom selected from the group consisting of an alkali metal atom and an alkaline earth metal atom, and a friction modifier (C) comprising a molybdenum-containing friction modifier, thereby preparing a lubricating oil composition such that a total content of an alkali metal atom and an alkaline earth metal atom is 2,000 mass ppm or less, or a content of a calcium atom is 1,900 mass ppm or less.
Specification