Lubricating oil composition
AssigneeIdemitsu Kosan Co., Ltd.
InventorsShoichiro FUJITA, Kenji SUNAHARA, Tsukasa YAMAGISHI, Masaya KUBOTA
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Abstract
A lubricating oil composition may contain a base oil (A) and a dispersant-type viscosity index improver (B), in which the nitrogen atom content based on the solid content of the dispersant-type viscosity index improver (B) is 0.50 to 1.50% by mass, and the weight-average molecular weight (Mw) thereof is 100,000 or more, and the content in terms of the solid content based on the total amount of the composition of the dispersant-type viscosity index improver (B) is more than 0.05% by mass and less than 5.0% by mass. The lubricating oil composition may exert excellent wear resistance in a state contaminated with soot.
Claims18
A lubricating oil composition, comprising:
- a base oil (A);
- and
- a dispersant-type viscosity index improver (B),
- wherein a solid content of the dispersant-type viscosity index improver (B) has a nitrogen atom content in a range of from 0.50 to 1.50% by mass,
- wherein the dispersant-type viscosity index improver (B) has a weight-average molecular weight (Mw) of 100,000 or more, and
- wherein, based on a total composition solid content, the dispersant-type viscosity index improver (B) is in a range of from more than 0.05 to less than 5.0% by mass.
Dependencies are inferred from the claim text.