Patent ID: 7648947
Filing Date: 2010-01-19
Classification: C10M,C10N

Abstract:
1. A lubricating oil composition for an internal combustion engine, consisting of: a lubricant base oil comprising a mineral oil and/or a synthetic oil, wherein a total aromatic content and sulfur content in the lubricating base oil are adjusted to 10% by mass of less and 0.05% by mass or less, respectively; (A) 0.001 to 0.5% by mass of an ester of boric acid in terms of boron element therein, represented by the following general formula (1) or (2)  wherein in the general formula (1) and (2), R and (B) 0.01 to 5% by mass of an ashless antioxidant; (C) 0.005 to 1% by mass of metal-based detergent in terms of metal element therein; and (D) 0.05 to 0.4% by mass of non-borated bis succinimide in terms of nitrogen element therein; wherein said composition contains substantially no metal salts of dithiophosphoric acid, has a sulfur content of 0.2% by mass or less, and contains substantially no phosphorus, the metal ratio of the component (C) is 3 or less, the percentage of (A)-(D) and the sulfur content being based on a total mass of the composition.