Patent ID: 8338342
Filing Date: 2012-12-25
Classification: C10M,C10N

Abstract:
1. A lubricating oil composition for an internal combustion engine, the internal combustion engine using a fuel that comprises at least one fat and oil selected from a group consisting of natural fat and oil, hydrotreated natural fat and oil, transesterified natural fat and oil and hydrotreated transesterified natural fat and oil, the lubricating oil composition comprising: a component (A) that is an alkaline earth metal-based detergent and a component (B) that is a boron derivative of a succinimide compound substituted by an alkyl or alkenyl group having a number average molecular weight of 200 to 5000, wherein a mass ratio (B/N) of boron (B) and nitrogen (N) in the component (B) is 0.5 or more, wherein the lubricant oil comprises the component (A) in an amount which contributes from 0.4 mass % to 2 mass % of alkaline earth metal based on the total amount of the composition, and the component (B) in an amount which contributes from 0.01 to 0.2 mass % of boron based on the total amount of the composition, and wherein the lubricant oil comprises at least one of a phenol-based antioxidant and an amine-based antioxidant in an amount of 0.3 mass % or more of the total amount of the composition.