US 2010/0075875 A1 · LUBRICATING OIL COMPOSITION FOR INTERNAL COMBUSTION ENGINE

Abstract

A lubricating oil composition for an internal combustion engine. The lubricating oil composition includes: (A1) a lubricant base oil as a main component having a kinematic viscosity at 100 degree C. being 1 to 8 mm2/s, pour point being −15 degree C. or less, aniline point being 100 degree C. or more, paraffinic content in saturates being 40 mass % or more, monocyclic naphthenic content being 25 mass % or less, bicyclic to hexacyclic naphthenic content being 35 mass % or less, iodine number being 2 or less, and ratio of tertiary carbon to the total carbon atoms composing the (A1) being 6.3% or more. The total mass of the composition is: (B) 0.005 to 0.5 mass % of a metallic detergent as metal content; (C1) 0.005 to 0.2 mass % of a boron-containing succinimide ashless dispersant as boron content; and (D) 0.005 to 0.2 mass % of a metal salt of phosphorus-containing acid as phosphorus content.

Claims14

Dependent claims

A lubricating oil composition for internal combustion engine, which comprises:

(A1) a lubricant base oil as a main component characterized by kinematic viscosity at 100 degree C. being 1 to 8 mm2/s, pour point being −15 degree C. or less, aniline point being 100 degree C. or more, paraffinic content in saturates being 40 mass % or more, monocyclic naphthenic content being 25 mass % or less, bicyclic to hexacyclic naphthenic content being 35 mass % or less, iodine number being 2 or less, and ratio of tertiary carbon to the total carbon atoms composing the (A1) being 6.3% or more;
and which further comprises, to the total mass of the composition:
(B) 0.005 to 0.5 mass % of a metallic detergent as metal content;
(C1) 0.005 to 0.2 mass % of a boron-containing succinimide ashless dispersant as boron content;
and
(D) 0.005 to 0.2 mass % of a metal salt of phosphorus-containing acid as phosphorus content.

3 more elements

Dependencies are inferred from the claim text.

Lubricating oil composition for internal combustion engine

Life of this patent

Lubricating oil composition for internal combustion engine

Life of this patent

Abstract

Claims14