Patent ID: 9353329
Filing Date: 2016-05-31
CPC Classification: C10M,C10N

Claim Text:
1. A lubricating oil composition comprising (A) a hydrocarbon base oil having a ratio (CA/CB) of proportion of component of 24 or fewer carbon atoms (CA) and proportion of component of 25 or more carbon atoms (CB) in a carbon number distribution obtained by gas chromatography distillation of 2.0 or higher, the composition having a ratio (Vs/Vk) of 80° C. high-temperature high-shear (HTHS) viscosity (Vk) and 150° C. HTHS viscosity (Vs) of 0.4 or higher and a 100° C. kinematic viscosity of 5.2 mm 2 /s or higher and 8 mm 2 /s or lower, wherein the hydrocarbon base oil is a mineral base oil selected from (a) a hydrocarbon base oil produced by subjecting a lubricating oil fraction produced by atmospheric- and/or vacuum-distillation of a crude oil to one or more refining processes selected from solvent deasphalting, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid treatment, and clay treatment, and (b) a synthetic base oil selected from poly-α-olefins and hydrogenated compounds thereof, isobutene oligomers and hydrogenated compounds thereof, paraffins, alkylbenzenes, and alkyl naphthalenes.