Crankcase lubricant compositions and method of improving engine deposit performance
First Claim
1. A lubricating oil composition, which comprises:
- (a) an oil of lubricating viscosity as the major component and (b) a tri-metal detergent mixture as a minor component, said tri-metal detergent mixture comprising at least one calcium overbased metal detergent, at least one magnesium overbased metal detergent and at least one sodium overbased metal detergent, said tri-metal detergent mixture being present in the oil composition in an amount such that the total TBN contributed to the oil composition by said tri-metal detergent mixture is from about 2 to about 12, said calcium overbased detergent contributing from about 8 to about 42% of the total TBN contributed by said tri-metal detergent mixture, said magnesium overbased detergent contributing from about 29 to about 60% of the total TBN contributed by said tri-metal detergent mixture, and said sodium overbased detergent contributing from about 15 to about 64% of the total TBN contributed by said tri-metal detergent mixture.
1 Assignment
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Accused Products
Abstract
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 tri-metal 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.
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Citations
38 Claims
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1. A lubricating oil composition, which comprises:
- (a) an oil of lubricating viscosity as the major component and (b) a tri-metal detergent mixture as a minor component, said tri-metal detergent mixture comprising at least one calcium overbased metal detergent, at least one magnesium overbased metal detergent and at least one sodium overbased metal detergent, said tri-metal detergent mixture being present in the oil composition in an amount such that the total TBN contributed to the oil composition by said tri-metal detergent mixture is from about 2 to about 12, said calcium overbased detergent contributing from about 8 to about 42% of the total TBN contributed by said tri-metal detergent mixture, said magnesium overbased detergent contributing from about 29 to about 60% of the total TBN contributed by said tri-metal detergent mixture, and said sodium overbased detergent contributing from about 15 to about 64% of the total TBN contributed by said tri-metal detergent mixture.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
- 36. A method of reducing the deposits which form in an internal combustion engine during the operation thereof due to deterioration of the crankcase lubricating oil that is used to lubricate the engine, which comprises using as the crankcase lubricating oil a composition which comprises an oil of lubricating viscosity as the major component and a tri-metal overbased detergent mixture of at least one calcium overbased metal detergent, at least one magnesium overbased metal detergent and at least one sodium overbased metal detergent as a minor component, wherein said tri-metal overbased detergent mixture is present in the crankcase lubricating oil composition in an amount such that the total TBN contributed to the oil composition by said tri-metal detergent mixture is from about 2 to about 12, said calcium overbased detergent contributing from about 8 to about 42% of the total TBN contributed by said tri-metal detergent mixture, said magnesium overbased detergent contributing from about 29 to about 60% of the total TBN contributed by said tri-metal detergent mixture, and said sodium overbased detergent contributing from about 15 to about 64% of the total TBN contributed by said tri-metal detergent mixture.
Specification