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Lubricating oil composition

Inactive Publication Date: 2006-01-19
SHELL OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0042] It is desirable to develop lubricating oil compositions having reduced sulphated ash, sulphur and/or phosphorus concentrations therein which

Problems solved by technology

Hence, in current low-SAPS lubricating oil compositions, sulphated ash levels, and consequently detergent levels, are low.
U.S. 2003 / 0148900 A1 indicates that increased amounts of antioxidants may have a detrimental effect on piston deposit control.

Method used

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  • Lubricating oil composition

Examples

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examples

Formulations

[0133] Table 1 indicates the formulations that were tested.

[0134] The formulations in Table 1 comprised conventional detergents, antifoam, dispersants, pour point depressants, viscosity index modifiers and zinc dithiophosphate additives, which were present as additive packages in diluent oil.

[0135] The phenolic antioxidant used was that available under the trade designation “Irganox L-135” ex. Ciba Specialty Chemicals Co. (C7-C9 branched alkyl esters of 3,5-bis(1,1-dimethyl-ethyl)-4-hydroxy-benzenepropanoic acid).

[0136] The aminic antioxidant used was that available under the trade designation “Irganox L-57” ex. Ciba Speciality Chemicals Co.

[0137] The base oils used in said formulations were mixtures of Group III base oils available from “The Royal Dutch / Shell Group of Companies” under the trade designations “XHVI-5.2” and “XHVI-8.2”.

[0138] All formulations described in Table 1 were SAE 5W30 viscosity grade oils.

[0139] Table 2 indicates the physical characteristi...

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Abstract

A lubricating oil composition for internal combustion engines which has a sulphated ash content of not greater than 0.9 wt. % and a phosphorus content in the range of from 0.04 to 0.1 wt. % is provided. The composition contains base oil, one or more detergents selected from phenate detergents, salicylate detergents and sulphonate detergents, wherein said one or more detergents each, independently, have a TBN (total base number) value in the range of from 30 to 350 mg.KOH / g, as measured by ISO 3771; and at least 3.5 wt. % of one or more antioxidants selected from the group of aminic antioxidants and / or phenolic antioxidants, based on the total weight of the lubricating oil composition.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a lubricating oil composition, in particular to a lubricating oil composition which is suitable for lubricating internal combustion engines. BACKGROUND OF THE INVENTION [0002] Total Base Number (TBN) is a measure of how well a lubricating oil composition can neutralise acidic by-products of combustion / oxidation and is defined as the quantity of acid, expressed in terms of the equivalent number of milligrams of potassium hydroxide, that is required to neutralize all basic constituents present in 1 gram of a sample of the lubricating oil composition (test methods include, for example, ISO 3771, ASTM D-2896 and ASTM D-4739). [0003] A high TBN is desirable in lubricating oil compositions in order to control corrosive engine wear from the acidic by-products of combustion / oxidation. Detergent additives in a lubricating oil composition are the primary source of alkalinity (TBN) and help to control, for example, top-ring deposit...

Claims

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Application Information

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IPC IPC(8): C10M159/20C10M163/00C10M167/00C10M169/04
CPCC10M163/00C10N2240/103C10M169/048C10M2203/1006C10M2203/1025C10M2207/026C10M2207/028C10M2207/262C10M2207/289C10M2215/064C10M2215/065C10M2223/045C10N2210/02C10N2230/04C10N2230/041C10N2230/06C10N2230/10C10N2230/40C10N2230/42C10N2230/43C10N2230/45C10N2240/10C10M167/00C10N2010/04C10N2030/04C10N2030/06C10N2030/10C10N2040/25C10N2030/041C10N2030/40C10N2030/42C10N2030/43C10N2030/45C10N2040/253
Inventor BUSSE, PETERLEONHARDT, HELMUTSANT, PETERWIILARS, MALCOM J.
Owner SHELL OIL CO
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