LUBRICATING OIL COMPOSITION
First Claim
1. A lubricating oil composition, comprisinga viscosity index improver (A) containing a comb-shaped polymer and having a shear stability index of 30 or less, anda base oil,whereina high temperature high shear viscosity at 150°
- C. is 1.6 to 2.9 mPa·
s, and a ratio of a kinematic viscosity at 40°
C. in mm2/s to the high temperature high sheer viscosity at 150°
C. is 12.4 or less.
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Accused Products
Abstract
The present invention provides a lubricating oil composition including a viscosity index improver (A) containing a comb-shaped polymer and having an SSI (shear stability index) of 30 or less together with a base oil, wherein an HTHS viscosity (high temperature high shear viscosity) at 150° C. (T150) is 1.6 to 2.9 mPa·s, and a ratio of a kinematic viscosity at 40° C. (V40) [mm2/s] to the HTHS viscosity at 150° C. (T150) [mPa·s] (V40/T150) is 12.4 or less. The lubricating oil composition of the present invention is excellent in fuel consumption reducing properties in a low-temperature region assuming the time of starting an engine while making various properties, such as a viscosity, etc., in a high-temperature region assuming the time of high-speed operation of an engine favorable.
9 Citations
16 Claims
-
1. A lubricating oil composition, comprising
a viscosity index improver (A) containing a comb-shaped polymer and having a shear stability index of 30 or less, and a base oil, wherein a high temperature high shear viscosity at 150° - C. is 1.6 to 2.9 mPa·
s, and a ratio of a kinematic viscosity at 40°
C. in mm2/s to the high temperature high sheer viscosity at 150°
C. is 12.4 or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- C. is 1.6 to 2.9 mPa·
-
16. A method for producing a lubricating oil composition, the method comprising
of blending a base oil with a viscosity index improver (A) containing a comb-shaped polymer and having shear stability index of 30 or less, thereby preparing the lubricating oil composition, which has a thigh temperature high shear viscosity at 150° - C. of 1.6 to 2.9 mPa·
s, and a ratio of a kinematic viscosity at 40°
C. mm2/s in to the high temperature high sheer viscosity at 150°
C. of 12.4 or less.
- C. of 1.6 to 2.9 mPa·
Specification