Lubricating oil compositions
AssigneeInfineum International Limited
InventorsJoseph P. Hartley, Nigel A. Male, Adam P. Marsh
Life of this patent
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Abstract
A lubricating oil composition which contains, or is made by admixing: (A) an oil of lubricating viscosity, in a major amount; (B) at least one oil-soluble or oil-dispersible sulfurized fatty acid ester, as an additive in an amount providing the lubricating oil composition with greater than or equal to 0.02 mass % sulphur; and, (C) at least one oil-soluble or oil-dispersible alkali metal or alkaline earth metal salicylate detergent, as an additive in an effective minor amount, providing greater than or equal to 5 mmol of salicylate soap per kilogram of the lubricating oil composition, wherein the lubricating oil composition does not contain a phosphorus ester additive.
Claims7
A lubricating oil composition having a TBN of from about 5 to about 12 mg KOH/g, which comprises or is made by admixing:
- (A) an oil of lubricating viscosity, in a major amount;
- (B) one or more oil-soluble or oil-dispersible sulfurized fatty acid ester(s) selected from sulfurized C5 to C29 aliphatic hydrocarbyl fatty acid alkyl ester derived from sulfurizing palm oil, corn oil, grapeseed oil, coconut oil, cottonseed oil, wheatgerm oil, soya oil, safflower oil, olive oil, peanut oil, rapeseed oil, sunflower oil, or a trans-esterified product thereof, or a combination thereof and having a sulphur content of from 5 to 20 mass %, as an additive in an amount providing the lubricating oil composition with from about 0.08 mass % to about 0.25 mass % sulphur;
- and,
- (C) one or more oil-soluble or oil-dispersible alkali metal or alkaline earth metal salicylate detergent(s) having a TBN at 100% active mass of from about 150 mg KOH/g to about 500 mg KOH/g, as an additive in an effective minor amount, providing from about 5.0 to about 15 mmol of salicylate soap per kilogram of the lubricating oil composition,
- wherein the lubricating oil composition does not comprise a phosphorus ester additive.
Dependencies are inferred from the claim text.