Patent ID: 8784642

Claim:
A lubricating oil composition having an SAE viscosity grade of 0W20 and having a kinematic viscosity at 100° C. of no less than 8.5 mm 2 /s and no greater than 9.3 mm 2 /s, a viscosity index in the range of 200 to 240, a high temperature-high shear viscosity of not less than 2.9 mPa·s at 150° C. and a Noack evaporation loss of not more than 13% for lubricating automotive engines wherein said lubricating oil composition comprises a base oil containing not less than 80 wt. % of a mineral base oil showing a kinematic viscosity in the range of 2 to 9 mm 2 /s at 100° C. and a viscosity index in the range of 133 to 160, and the below-described additive components: a) nitrogen-containing ashless dispersant in an amount of 0.01-0.3 wt. % in terms of nitrogen content; b) an alkaline earth metal-containing detergent in an amount of 0.08-0.3 wt. % in terms of alkaline earth metal content; c) a phosphorus-containing wear inhibitor in an amount of 0.05-0.12 wt. % in terms of phosphorus content; d) an oxidation inhibitor selected from the group consisting of amine compounds, phenol compounds, and molybdenum compounds, in an amount of 0.1-7 wt. %, and e) a viscosity index improver in an amount of 0.5-20 wt. %, wherein the amounts of the additive components are in terms of wt. % based on a total amount of the lubricating oil composition.