Title:
LUBRICANTS CONTAINING A BIMETALLIC DETERGENT SYSTEM AND A METHOD OF REDUCING NOx EMISSIONS EMPLOYING SAME
Document Type and Number:
WIPO Patent Application WO2001044419
Kind Code:
A8
Abstract:
A lubricating oil composition comprising a major amount of an oil of lubricating viscosity and an additive system comprising (A) from about 0.1 to about 5 % by weight of a detergent composition comprising at least two metal overbased compositions wherein said detergent composition consists essentially of (A-1) at least one alkali metal overbased detergent and (A-2) at least one calcium overbased detergent, wherein the ratio of total base number on a per 100 TBN and diluent-free basis contributed by the alkali metal detergent to the total base number contributed by the calcium detergent ranges from about 99.5-20 to about 0.5-80; (B) from about 1 to about 10 % by weight of a succinimide dispersant; and (C) from about 0.1 to about 5 % by weight of a metal dihydrocarbyl dithiophosphate of the formula (I) wherein R<1> and R<2> are each, independently, hydrocarbyl groups containing from 3 to 13 carbon atoms, M is a metal and n is an integer equal to the valence of M. Also disclosed a re methods for cleaning the combustion chamber of internal combustion engines, a method for reducing fuel consumption of internal combustion engines and a method for reducing NOx emissions of internal combustion engines.
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Inventors:
WILK MELODY A (US)
Application Number:
PCT/US2000/033703
Publication Date:
April 22, 2004
Filing Date:
December 13, 2000
Export Citation:
Assignee:
LUBRIZOL CORP (US)
WILK MELODY A (US)
WILK MELODY A (US)
International Classes:
C10M169/04; C10M133/56; C10M137/10; C10M159/20; C10M159/22; C10M159/24; C10M163/00; C10M167/00; C10N10/02; C10N10/04; C10N10/06; C10N10/08; C10N10/12; C10N10/14; C10N10/16; C10N20/00; C10N30/00; C10N30/02; C10N40/25; (IPC1-7): C10M163/00; C10M167/00
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