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US 2026/0028548 A1Published application
Lubricant compositions for direct injection engines
AssigneeThe Lubrizol Corporation
InventorsPatrick E. Mosier, Jeffry G. Dietz, Alexander Sammut
Life of this patent
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Abstract
The invention is directed to a method for reducing low speed pre-ignition events in a spark-ignited direct injection internal combustion engine by supplying to the sump a lubricant composition which contains an oil of lubricating viscosity and a metal overbased detergent. The metal overbased detergent may be selected from sulfonate detergents, phenate detergents, and salicylate detergents, especially sulfonate detergents with a metal ratio of at least 5.
Claims10
A lubricant composition comprising:
- (a) a base oil of lubricating viscosity;
- (b) at least one magnesium salicylate overbased detergent in an amount to provide at least 450 ppm magnesium from the magnesium overbased detergent to the lubricating composition;
- (c) at least one calcium salicylate overbased detergent in an amount to provide at least 1,000 ppm calcium to the lubricating composition;
- and
- (d) 0.5 to 0.9 wt. % of a zinc dialkyldithiophosphate anti-wear additive, wherein the magnesium salicylate overbased detergent and the calcium salicylate overbased detergent collectively contribute up to about 0.9 weight percent of sulfated ash to the lubricating composition and wherein the lubricating composition has a phosphorus content of 0.12 wt. % or less and total sulfated ash of 1.1% or less.
2 more elements
A lubricant composition comprising:
- (a) a base oil of lubricating viscosity;
- (b) at least one magnesium salicylate overbased detergent in an amount to provide at least 450 ppm magnesium from the magnesium overbased detergent to the lubricating composition;
- (c) at least one calcium salicylate overbased detergent in an amount to provide at least 1,000 ppm calcium to the lubricating composition;
- and
- (d) 0.5 to 0.9 wt. % of a zinc dialkyldithiophosphate anti-wear additive, wherein the magnesium salicylate overbased detergent and the calcium salicylate overbased detergent collectively contribute up to about 0.9 weight percent of sulfated ash to the lubricating composition and wherein the lubricating composition has a phosphorus content of 0.12 wt. % or less and total sulfated ash of 1.1% or less, where the lubricant composition is capable of reducing low speed pre-ignition events in a spark-ignited direct injection internal combustion engine
2 more elements
Dependencies are inferred from the claim text.