Abstract: A lubricating oil for an internal combustion engine is disclosed. The lubricating oil can provide reduced friction and can cope with environmental regulations requiring a high corrosion-preventing effect. The lubricating oil composition contains a mono or diester of glycerin and a straight-chain or branched fatty acid of C6 to 20 having a saturated hydrocarbyl group; a triazole derivative; and a mixture of primary zinc dialkyl dithiophosphate and secondary zinc dialkyl dithiophosphate.

Abstract: The present invention provides an anti-wear compound selected from phosphorus compounds as represented by the following General Formula (2) or metal salts thereof as represented by the following General Formula (3).

Abstract: Lubricating oil composition for use in diesel engines which comprises, in the base oil, not more than 0.3% by mass of sulphated ash, from 0.01 to 0.2% by mass of nitrogen in succinimides, from 0.05 to 0.12% by mass of zinc in zinc dithiophosphates, from 0.02 to 0.3% by mass of nitrogen in amine-based anti-oxidants, and from 0.01 to 0.08% by mass of boron, which further has a total value of [(zinc amount in zinc dithiophosphates)×(nitrogen amount in succinimides)] and [(zinc amount in zinc dithiophosphates)×(nitrogen amount in amine-based anti-oxidants)] as regards the aforementioned of from 0.015 to 0.06, and which does not contain salicylate, phenate or sulphonate metallic detergents. The intention is to obtain a lubricating oil composition for use in diesel engines which does not contain a metallic detergent yet maintains excellent engine (piston) detergency while preventing DPF clogging, and which reduces valve-train wear.

Abstract: The present invention provides a lubricating composition comprising: a base oil; and a viscosity index improver containing poly(meth)acrylate having hydroxyl groups in the structure and having a hydroxyl value of from 22 to 37.

Abstract: The present invention provides an anti-wear compound selected from phosphorus compounds as represented by the following General Formula (2) or metal salts thereof as represented by the following General Formula (3).

Abstract: The present invention provides a lubricating oil composition comprising a metal dithiophosphate and a poly(meth)acrylate containing a polar hydroxyl group in a base oil.

Abstract: A lubricating oil composition is provided containing a base oil having a kinematic viscosity at 40° C. in the range of from 2 to 20 mm2/s and a viscosity index of 50 or more and a polymethacrylate, wherein the lubricating oil composition has a kinematic viscosity at 40° C. in the range of from 22 to 95 mm2/s; a kinematic viscosity at 100° C. in the range of from 10 to 30 mm2/s; a pour point of ?10° C. or less; a CCS viscosity at ?20 ° C. of 2500 mPas or less; and a flash point of 140° C. or more.