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Title:
LUBRICATING OIL COMPOSITION FOR AUTOMATIC TRANSMISSION
Document Type and Number:
Japanese Patent JP2008179662
Kind Code:
A
Abstract:

To provide a lubricating oil composition for automatic transmissions that can achieve both fuel-saving property and the durability of parts while retaining the initial viscosity.

The lubricating oil composition for automatic transmissions comprises (A) a base oil having a kinematic viscosity of 9-20 mm2/s at 40C and, incorporated therewith, (B) 0.5-30 mass% of a polymethacrylate-based viscosity index improver having a weight-average molecular weight (in terms of polystyrene) of 15,000-70,000 and (C) 0.5-30 mass% of a polymethacrylate-based viscosity index improver having a weight-average molecular weight of 100,000-500,000, wherein (D) the content ratio of the component (B) to the component (C) is 3-10 by mass; (E) the kinematic viscosity of the composition is 5.2-6.5 mm2/s at 100C; and (F) the composition has a viscosity index of at least 180.


Inventors:
Shimura, Keiko
Tochigi, Hiroshi
Taya, Takahiro
Application Number:
JP2007000012362
Publication Date:
August 07, 2008
Filing Date:
January 23, 2007
Export Citation:
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Assignee:
COSMO SEKIYU LUBRICANTS KK
International Classes:
C10M169/04; C10M101/02; C10M105/04; C10M105/06; C10M105/36; C10M105/38; C10M105/74; C10M107/02; C10M107/08; C10M107/50; C10M145/14; C10M149/04; C10M151/02; C10N20/02; C10N20/04; C10N30/00; C10N30/02; C10N40/04
Domestic Patent References:
2006-03-23
2005-06-16
2006-02-16
2004-06-17
2002-07-10
2001-09-11
2006-05-11
2006-05-11
2001-09-11
2005-07-14
2006-02-16
2006-03-23
2005-06-16
2004-06-17
2002-07-10