Zinc free lubricating compositions and methods of using the same
AssigneeThe Lubrizol Corporation
InventorsPaul R. Vincent, William R. S. Barton, Emma Fahey, Yanshi Zhang, Mark C. Davies, Ewan E. Delbridge
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Abstract
The instant disclosure generally relates to lubricating compositions having an oil of lubricating viscosity, an ashless phosphorus-containing antiwear agent an alkaline earth metal detergent, an ashless antioxidant, and an ashless dispersant where the lubricating compositions are substantially free of zinc and methods of lubricating an engine with such lubricating compositions. The instant lubricating compositions are useful as alternative lubricating compositions the reduce and/or eliminate zinc to achieve a desired performance goal of the lubricating composition.
Claims25
A method for reducing low speed pre-ignition in an engine, comprising suppling to a spark-ignited direct injection internal combustion engine a lubricant composition comprising:
- a base oil of lubricating viscosity;
- an ashless phosphorus-containing antiwear agent, wherein the ashless phosphorous
- containing antiwear agent comprises an alkyl (thio)phosphate amine salt, wherein at
- least 30 mole percent of phosphorous atoms in the alkyl (thio)phosphate amine salt
- are in an alkyl pyrophosphate salt structure;
- an alkaline earth metal detergent:
- an ashless antioxidant;
- and
- an ashless dispersant,
- where the lubricant composition is substantially free of zinc.
Dependencies are inferred from the claim text.