CRANKCASE LUBRICANT COMPOSITIONS AND METHOD OF IMPROVING ENGINE DEPOSIT PERFORMANCE

A low phosphorus passenger car motor oil containing an oil of lubricating viscosity as the major component and a tri-metal detergent mixture as a minor component. Wherein the tri-metal detergent mixture comprises at least one calcium overbased metal detergent, at least one magnesium overbased metal...

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Bibliographic Details
Main Authors BOFFA, ALEXANDER B, BIDWELL, THOMAS R
Format Patent
LanguageEnglish
French
Published 03.06.1999
Edition7
Subjects
CHEMISTRY
FUELS
INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS
LUBRICANTS
LUBRICATING COMPOSITIONS
METALLURGY
PEAT
PETROLEUM, GAS OR COKE INDUSTRIES
TECHNICAL GASES CONTAINING CARBON MONOXIDE
USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION
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Summary:A low phosphorus passenger car motor oil containing an oil of lubricating viscosity as the major component and a tri-metal detergent mixture as a minor component. Wherein the tri-metal detergent mixture comprises at least one calcium overbased metal detergent, at least one magnesium overbased metal detergent and at least one sodium overbased metal detergent, wherein the trimetal detergent mixture is present in the oil composition in an amount such that the total TBN contributed to the oil composition by the tri-metal detergent mixture is from about 2 to about 12, and wherein the calcium overbased detergent contributes from about 8 to about 42 % of the total TBN contributed by the tri-metal detergent mixture, the magnesium overbased detergent contributes from about 29 to about 60 % of the total TBN contributed by the tri-metal detergent mixture, and the sodium overbased detergent contributes from about 15 to about 64 % of the total TBN contributed by the tri-metal detergent mixture.
Bibliography:Application Number: CA19982311556