The present invention provides a lubricating oil composition comprising: a lubricating base oil including a lubricating base oil component having a urea adduct value of 4% by mass or less, a kinematic viscosity of 25 mm2/s or less at 40° C. and a viscosity index of 120 or greater, wherein the amount
The present invention provides a lubricating oil composition comprising: a lubricating base oil including a lubricating base oil component having a urea adduct value of 4% by mass or less, a kinematic viscosity of 25 mm2/s or less at 40° C. and a viscosity index of 120 or greater, wherein the amount of the lubricating base oil component is 10 to 100% by mass based on a total mass of the lubricating base oil, anda poly(meth)acrylate based viscosity index improver including a structural unit represented by general formula (1): wherein R1 represents hydrogen or a methyl group, and R2 represents a straight or branched hydrocarbon group with 16 or more carbon atoms, and wherein the proportion of the structural unit represented by general formula (1) is 0.5 to 70% by mole, the lubricating oil composition having a kinematic viscosity of 4 to 12 mm2/s at 100° C. and a viscosity index of 140 to 300.
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1. A lubricating oil composition comprising: a lubricating base oil including a lubricating base oil component having a urea adduct value of 4% by mass or less, a kinematic viscosity of 25 mm2/s or less at 40° C. and a viscosity index of 120 or greater, and comprising a saturated component that cont
1. A lubricating oil composition comprising: a lubricating base oil including a lubricating base oil component having a urea adduct value of 4% by mass or less, a kinematic viscosity of 25 mm2/s or less at 40° C. and a viscosity index of 120 or greater, and comprising a saturated component that contains cyclic and acyclic components, wherein the saturated component content is 90% or greater based on the total weight of the lubricating base oil, and wherein the proportion of cyclic saturated components among the saturated components is 0.1 to 50%, and wherein the amount of the lubricating base oil component is 10 to 100% by mass based on a total mass of the lubricating base oil; anda poly(meth)acrylate based viscosity index improver including a structural unit represented by general formula (1): wherein R1 represents hydrogen or a methyl group, and R2 represents a straight or branched hydrocarbon group with 16 or more carbon atoms, and wherein the proportion of the structural unit represented by general formula (1) is 0.5 to 70% by mole, the lubricating oil composition having a kinematic viscosity of 4 to 12 mm2/s at 100 ° C. and a viscosity index of 140 to 300. 2. The lubricating oil composition according to claim 1, wherein the poly(meth)acrylate based viscosity index improver is a dispersant poly(meth)acrylate based viscosity index improver. 3. The lubricating oil composition according to claim 1, wherein the poly(meth)acrylate based viscosity index improver has a PSSI of 40 or less and a ratio of weight average molecular weight and PSSI of 1×104 or greater. 4. The lubricating oil composition according to claim 1, wherein R2 in general formula (1) is a branched hydrocarbon group with 20 or more carbon atoms. 5. The lubricating oil composition according to claim 1, further comprising at least one friction modifier selected from organic molybdenum compounds and ashless friction modifiers. 6. A lubricating oil composition comprising: a lubricating base oil having a kinematic viscosity of 1 to 10 mm2/s at 100° C. and a % CA of 5 or less, and comprising a saturated component that contains cyclic and acyclic components, wherein the saturated component content is 90% or greater based on the total weight of the lubricating base oil, and wherein the proportion of cyclic saturated components among the saturated components is 0.1 to 50%; anda viscosity index improver having a weight average molecular weight of 50,000 or greater and a ratio of the weight average molecular weight and PSSI of 0.8×104 or greater, wherein the amount of the viscosity index improver is 0.1 to 50% by mass based on a total mass of the lubricating oil composition,the lubricating oil composition having a kinematic viscosity of 3 to 9.3 mm2/s at 100° C. and a ratio of HTHS viscosity at 150° C. to HTHS viscosity at 100° C. of 0.50 or greater. 7. The lubricating oil composition according to claim 6, wherein the lubricating oil composition has an HTHS viscosity of 2.6 mPa·s or greater at 150° C. and an HTHS viscosity of 5.3 mPa·s or less at 100° C. 8. A lubricating oil composition comprising: a lubricating base oil including as a main component, a lubricating base oil component having a saturated component content of 95% by mass or greater, a proportion of cyclic saturated component of 60% by mass or less in the saturated component, a viscosity index of 120 or greater, an urea adduct value of not greater than 4% by mass, and ε-methylene content in total constituent carbons at a proportion of 15 to 20%; anda viscosity index improver having a weight average molecular weight of 50,000 or greater and a ratio of the weight average molecular weight to PSSI of 1×104 or greater, in an amount of 0.1 to 50% by mass based on a total mass of the lubricating oil composition,the lubricating oil composition having a kinematic viscosity of 3.0 to 12.0 mm2/s at 100° C. and a ratio of HTHS viscosity at 150° C. to HTHS viscosity at 100° C. of 0.50 or greater. 9. The lubricating oil composition according to claim 8, wherein the lubricating oil composition has an HTHS viscosity of 2.6 mPa·s or greater at 150° C. and an HTHS viscosity of 5.3 mPa·s or less at 100° C. 10. The lubricating oil composition according to claim 8, wherein the viscosity index improver is a dispersant poly(meth)acrylate based viscosity index improver. 11. The lubricating oil composition according to claim 8, further comprising at least one friction modifier selected from organic molybdenum compounds and ashless friction modifiers.
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