Patent ID: 11965142
Assignee: IDEMITSU KOSAN CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A lubricating oil composition, comprising:
a base oil;
an organic molybdenum compound; and
a metallic detergent comprising a calcium-based detergent and a magnesium-based detergent,
wherein the calcium-based detergent comprises calcium sulfonate in an amount of 0.12% by mass or more in terms of calcium atoms based on the mass of the lubricating oil composition,
wherein the content of a magnesium-based detergent is less than 0.05% by mass in terms of magnesium atoms, based on total lubricating oil composition mass,
wherein the lubricating oil composition has a base number in a range of from more than 6.1 to 11.0 mg KOH/g,
wherein a [Mo/soap groups] mass content ratio of molybdenum atoms derived from the organic molybdenum compound to soap groups derived from the metallic detergent based on the lubricating oil composition is 0.06 or more, and
wherein the lubricating oil composition has an HTHS viscosity at 150° C. in a range of from 1.3 to less than 2.3 mPa·s.