Lubricating oil composition

A method for producing a lubricating oil composition, comprising:

• mixing a base oil comprising a mineral oil and an oxygen-containing synthetic oil, and a viscosity index improver comprising a comb-shaped polymer,
• wherein the lubricating oil composition has a kinematic viscosity at 100° C. regulated to 9.3 mm2/s or less, a viscosity index regulated to 280 or more, and a content Y (% by mass) of the oxygen-containing synthetic oil based on a total amount of the lubricating oil composition being regulated to satisfy α≤Y<−3.7 ln(X)+β(1) where α=1.0, β=19, and X is a ratio of a number of carbon atoms and a number of oxygen atoms per one molecule of the oxygen-containing synthetic oil, the base oil has a content ratio in terms of a mass ratio of the mineral oil and the oxygen-containing synthetic oil in a range of 3.0 to 20.0, and the resin content of the comb-shaped polymer (B1) is in a range of 0.5% by mass to 5.0% by mass based on the total amount of the lubricating oil composition the lubricating oil composition has a high temperature high shear viscosity at 150° C. of 2.70 mPa·s or less, and if the comb-shaped polymer comprises a comb-shaped polymer having a polar group on a side chain, the mass ratio of the mineral oil and the oxygen-containing synthetic oil is in a range of 3.0 to 18.0.