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US 2017/0247628 A1Published application
Marine diesel lubricating composition
AssigneeThe Lubrizol Corporation
InventorsStephen J. Cook, Natasha K. Horn, Shaun P. Carney, Mark C. Davies, David M. Hobson
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Abstract
The invention provides a method of lubricating a 2-stroke marine diesel cylinder liner with a lubricating composition having a total base number of 10 to 25 mg KOH/g. The invention further provides a lubricating composition for lubricating the 2-stroke marine diesel cylinder liner.
Claims32
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A lubricating composition comprising:
- an oil of lubricating viscosity,
- an alkali earth metal sulphonate detergent present in an amount to provide at least 1 wt % sulphonate soap to the lubricating composition,
- an alkaline earth metal phenol-based detergent present in amount to provide at least 3.5 wt % phenol-containing soap to the lubricating composition,
- wherein the phenol-based detergent is chosen from, a salixarate, a salicyclate and mixtures thereof,
- the a sulphonate detergent comprises a mixture of a 300 TBN or higher alkaline earth metal sulphonate detergent having a metal ratio of 10 to 40, and a TBN of less than 100 (or 85 or less) alkaline earth metal sulphonate detergent having a metal ratio of 1 to 6 (or 1 to 5),
- the sulphonate detergent provides no more than 50% of the total base number derived from a detergent, and
- the lubricating composition has a total base number of 10 to 25 mg KOH/g.
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Dependencies are inferred from the claim text.