Lubricant composition for an internal combustion engine and method for lubricating an internal combustion engine

摘要

A lubricating oil composition for an internal combustion engine contains: a base oil including a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at −35 degrees C. of 3000 mPa·s or less and a NOACK of 12 mass % or less and a component (B) of a mineral oil having a viscosity index of 120 or more; and polyisobutylene having a mass average molecular weight of 500,000 or more. A content of the composition (A) is 25 mass % or more of a total amount of a lubricating oil.

主权项

1. A lubricating oil composition for an internal combustion engine, comprising:
a base oil comprising:
a component (A) of a polyalphaolefin having a kinematic viscosity at 100 degrees C. of 5.5 mm2/s or less, a CCS viscosity at −35 degrees C. of 3000 mPa·s or less and a NOACK of 12 mass % or less, wherein the component (A) is provided by polymerization with a metallocene catalyst anda component (B) of a mineral oil having a viscosity index of 120 or more; and polyisobutylene having a mass average molecular weight of 500,000 or more; wherein the component (A) is present in the lubricating oil composition in an amount of 25 mass % or more relative to the total amount of the lubricating oil composition, and wherein the polyisobutylene content ranges from 0.015 mass % to 0.15 mass % of the total amount of the lubricating oil composition.