Jx Nippon Oil Energy Corporation

Akio Mutou

Shigeki Matsui

Akira Yaguchi

Mari Nagae

The lubricating oil composition of the invention comprises a lubricating base oil with a 100&#xb0; C. kinematic viscosity of 1-20 mm/s, (A) a friction modifier, (B) a first overbased metal salt obtained by overbasing an oil-soluble metal salt with an alkaline earth metal borate, and (C) an overbased second oil-soluble metal salt obtained by overbasing an oil-soluble metal salt with an alkaline earth metal carbonate.

Lubricant composition

The lubricating oil composition of the invention includes a lubricating base oil with a kinematic viscosity at 100&#xb0; C. of 1-6 mm/s, a % Cof 70 or greater and a % Cof no greater than 2, and a viscosity index improver which, when added to the lubricating base oil, results in an A/B ratio of less than 3.2 and a C/B ratio of less than 1.5. A is the thickening effect on the kinematic viscosity at 100&#xb0; C., B is the thickening effect on the HTHS viscosity at 150&#xb0; C., and C is the thickening effect on the HTHS viscosity at 100&#xb0; C.

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Tokyo, Japan

Akio Mutou