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US 2004/0176257 A1Published application
Methods and compositions for reducing wear in heavy-duty diesel engines
AssigneeChevron Oronite Company LLC
InventorsAlexander B. Boffa, William M. Kleiser
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Abstract
Disclosed are methods and lubricant compositions for reducing wear in heavy-duty diesel engines. The lubricant compositions disclosed herein comprise a combination of an anti-wear effective amount of a dispersed, hydrated alkali metal borate, a neutral sulfonate and an overbased detergent composition.
Claims10
A lubricating oil composition suitable for use in a heavy-duty diesel engine which composition comprises a major amount of an oil of lubricating viscosity,
- a) a sufficient amount of an overbased detergent additive to control deposits during operation of said heavy-duty diesel engine;
- b) a sufficient amount of a neutral alkali or alkaline earth metal sulfonate having a TBN of less than 25 to control deposits during high temperature operation of said heavy-duty diesel engine;
- and
- c) a sufficient amount of a dispersed, hydrated alkali metal borate to inhibit wear during operation of said heavy-duty diesel engine.
1 more element
A method for controlling wear and deposits during operation of a heavy-duty diesel engine, which method comprises:
- a) operating the engine with a lubricant composition comprising a major amount of an oil of lubricating viscosity,
- b) a sufficient amount of an overbased detergent additive to control deposits during operation of said heavy-duty diesel engine;
- c) a sufficient amount of a neutral alkali or alkaline earth metal sulfonate having a TBN of less than 25 to control deposits during high temperature operation of said heavy-duty diesel engine;
- and
- d) a sufficient amount of a dispersed, hydrated alkali metal borate to inhibit wear during operation of said heavy-duty diesel engine.
2 more elements
Dependencies are inferred from the claim text.