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US 12,275,912 B2Granted
Lubricant compositions for direct injection engine
AssigneeThe Lubrizol Corporation
InventorsPatrick E. Mosier, Jeffry G. Dietz, Alexander Sammut, Mary Galic Raguz, Matthew D. Gieselman
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 an ashless dispersant. The ashless dispersant may be selected from succinimide compounds prepared from aliphatic or aromatic amines.
Claims15
A method for reducing low speed pre-ignition events in a spark-ignited direct injection internal combustion engine comprising:
- operating the engine under a load with a brake mean effective pressure (BMEP) of greater than or equal to 10 bars at speeds less than or equal to 3,000 rpm;
- and
- supplying to the engine a lubricant composition comprising:
- a base oil of lubricating viscosity;
- 0.5 to 2.2 wt % of a boron-containing ashless dispersant;
- 0.1 to 3 wt % of at least one ashless antioxidant;
- and
- 0.2 to 1 wt % of a magnesium salicylate detergent.
5 more elements
Dependencies are inferred from the claim text.