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

Claim 19:
20. 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 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 in a range of from 0.06 to less than 2.05, 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.