Use of a lubricating oil composition for lubrication in internal combustion engines wherein at least a piston head of the internal combustion engines is formed of a cast iron material, wherein the lubricating oil composition comprises: a base oil that contains at least one selected from the group consisting of a mineral oil and a synthetic oil, has a viscosity index of 120 or more, and has a paraffin content by ring analysis of 70% or more; a dispersant containing one or more compounds selected from the group consisting of an alkenylsuccinimide, a boronated alkenylsuccinimide, an alkylsuccinimide and a boronated alkylsuccinimide, wherein the component contains at least either a boronated alkenylsuccinimide or a boronated alkylsuccinimide; and a molybdenum dithiocarbamate; wherein the component is contained in an amount of from 0.01% by mass to 0.10% by mass in terms of the nitrogen content thereof based on the total amount of the composition, wherein the boronated alkenylsuccinimide or boronated alkylsuccinimide or the both are contained in the component at an amount of from 0.05% by mass to 3.5% by mass based on the total amount of the composition, and the ratio by mass of boron to nitrogen (B/N ratio) in the boronated alkenylsuccinimide or boronated alkylsuccinimide contained in the component is 0.5 or more, the phosphorus content based on the total amount of the composition is from 100 ppm by mass to 1200 ppm by mass, the sulfated ash content based on the total amount of the composition is 1.2% by mass or less, and the molybdenum content based on the total amount of the composition is from 300 ppm by mass to 1000 ppm by mass. a base oil that contains at least one selected from the group consisting of a mineral oil and a synthetic oil, has a viscosity index of 120 or more, and has a paraffin content by ring analysis of 70% or more; a dispersant containing one or more compounds selected from the group consisting of an alkenylsuccinimide, a boronated alkenylsuccinimide, an alkylsuccinimide and a boronated alkylsuccinimide, wherein the component contains at least either a boronated alkenylsuccinimide or a boronated alkylsuccinimide; and a molybdenum dithiocarbamate; a dispersant containing one or more compounds selected from the group consisting of an alkenylsuccinimide, a boronated alkenylsuccinimide, an alkylsuccinimide and a boronated alkylsuccinimide, wherein the component contains at least either a boronated alkenylsuccinimide or a boronated alkylsuccinimide; and a molybdenum dithiocarbamate; wherein the component is contained in an amount of from 0.01% by mass to 0.10% by mass in terms of the nitrogen content thereof based on the total amount of the composition, wherein the boronated alkenylsuccinimide or boronated alkylsuccinimide or the both are contained in the component at an amount of from 0.05% by mass to 3.5% by mass based on the total amount of the composition, and the ratio by mass of boron to nitrogen (B/N ratio) in the boronated alkenylsuccinimide or boronated alkylsuccinimide contained in the component is 0.5 or more, the phosphorus content based on the total amount of the composition is from 100 ppm by mass to 1200 ppm by mass, the sulfated ash content based on the total amount of the composition is 1.2% by mass or less, and the molybdenum content based on the total amount of the composition is from 300 ppm by mass to 1000 ppm by mass.