Gasoline engine lubricant oil composition and manufacturing method therefor

2:

• The lubricating oil composition according to claim 1, wherein a content of the calcium detergent as converted into a calcium atom is 2,000 ppm by mass or less on a basis of the whole amount of the composition.

3:

• The lubricating oil composition according to claim 1, further comprising:
• a boron-containing succinimide,
• wherein a content of the boron-containing succinimide as converted into a boron atom being 50 ppm by mass or more on a basis of the whole amount of the lubricating oil composition.

4:

• The lubricating oil composition according to claim 1, further comprising:
• a poly(meth)acrylate-based viscosity index improver.

5:

• The lubricating oil composition according to claim 1, wherein the content of the molybdenum dithiocarbamate as converted into a molybdenum atom is 60 to 1,200 ppm by mass on a basis of the whole amount of the lubricating oil composition.

6:

• The lubricating oil composition according to claim 1, wherein the content of the molybdenum dithiocarbamate as converted into a molybdenum atom is 100 to 1,100 ppm by mass on a basis of the whole amount of the lubricating oil composition.

7:

• The lubricating oil composition according to claim 1, wherein the content of the molybdenum dithiocarbamate as converted into a molybdenum atom is 300 to 1,100 ppm by mass on a basis of the whole amount of the lubricating oil composition.

8:

• The lubricating oil composition according to claim 1, wherein a content of the calcium detergent as converted into a calcium atom is 1,000 to 2,000 ppm by mass on a basis of the whole amount of the lubricating oil composition.

9:

• The lubricating oil composition according to claim 1, which does not include a sodium detergent.

10:

• The lubricating oil composition according to claim 1, wherein the base oil is at least one selected from a mineral oil and a synthetic oil which are classified into Groups 3 to 5 of the base stock categories of the API (American Petroleum Institute).

11:

• The lubricating oil composition according to claim 1, which has a kinematic viscosity at 100° C. of 3.8 to 12.5 mm2/s.

12:

• The lubricating oil composition according to claim 1, which is adapted to function as a lubricating oil composition for a gasoline engine.