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Title:
LUBRICATING OIL COMPOSITION
Document Type and Number:
Japanese Patent JP2008024938
Kind Code:
A
Abstract:

To provide a lubricating oil composition which contains Mg in a relatively high concentration but can reduce bore polishing and a sulfate ash.

This lubricating oil composition for diesel engines comprises (a) a lubricating oil base stock having a lubricating viscosity; (b) at least 0.6 to 3.0 mass% of an antioxidant component selected from ash-free amine compounds and/or sulfur-free phenolic compounds; (c) a lubricant component selected from magnesium sulfonates, magnesium salicylate and magnesium phenate, and having a total base number (TBN) of 350 mg per g of KOH and gives Mg of 0.05 mass% to the lubricant composition; and, if necessary, (d) 0.0 to 1.8 mass% of a metal hydrocarbyl dithiophosphate compound, and has an ash content of 0.6 to 2.0 mass% measured according to ASTM D874.


Inventors:
SCOTT ROBIN HOWARD
SHAW ROBERT WILLIAM
Application Number:
JP2007189132A
Publication Date:
February 07, 2008
Filing Date:
July 20, 2007
Export Citation:
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Assignee:
INFINEUM INT LTD
International Classes:
C10M169/04; C10M101/02; C10M129/10; C10M133/04; C10M137/10; C10M149/00; C10M159/22; C10M159/24; C10N20/00; C10N40/25
Domestic Patent References:
JP2006097027A2006-04-13
JPH09512584A1997-12-16
JPH07150185A1995-06-13
JP2006152304A2006-06-15
JP2001303087A2001-10-31
JP2002105482A2002-04-10
Attorney, Agent or Firm:
Sadao Kumakura
Nobuo Ogawa
Atsushi Hakoda
Kenji Asai
Koji Hirayama



 
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