Abstract: The present invention provides a lubricant composition comprising a base oil of lubricating viscosity, wherein the base oil comprises an ether base stock of formula (A), where: Ra and Rb are aliphatic hydrocarbyl groups and may be the same or different; the lubricant composition further comprising at least one aminic anti-oxidant and at least one phenolic anti-oxidant. In some embodiments, the ether base stock has the formula (1), where: R1 R2, R3, R4, R5 and R6 are as defined herein. The lubricant composition may be used for lubricating a surface in an internal combustion engine as well as for improving the fuel economy performance and/or piston cleanliness performance of an engine and/or a vehicle, such as an automotive vehicle associated with an internal combustion engine.

Abstract: The present invention provides a lubricant composition for an internal combustion engine comprising a base oil of lubricating viscosity, wherein the base oil comprises an ether base stock of formula (A): where: Ra and Rb are aliphatic hydrocarbyl groups and may be the same or different; wherein at least one of Ra and Rb is branched-chain alkyl, alkoxy-substituted-alkyl or cycloalkyl-substituted-alkyl; the lubricant composition further comprising at least one aminic anti-oxidant and/or at least one phenolic anti-oxidant; and wherein the total combined amount of aminic and phenolic anti-oxidant in the lubricant composition is not more than 4.0% by weight of the lubricant composition. In some embodiments, the ether base stock has the formula (1): where: R1, R2, R3, R4, R5 and R6 are as defined herein.

Abstract: The present invention provides a lubricant composition comprising a base oil of lubricating viscosity, wherein the base oil comprises an ether base stock of formula (A), where: Ra and Rb are aliphatic hydrocarbyl groups and may be the same or different; the lubricant composition further comprising at least one aminic anti-oxidant and at least one phenolic anti-oxidant. In some embodiments, the ether base stock has the formula (1), where: R1 R2, R3, R4, R5 and R6 are as defined herein. The lubricant composition may be used for lubricating a surface in an internal combustion engine as well as for improving the fuel economy performance and/or piston cleanliness performance of an engine and/or a vehicle, such as an automotive vehicle associated with an internal combustion engine.

Abstract: The present invention provides a lubricant composition comprising a base oil of lubricating viscosity, wherein the base oil comprises an ether base stock of formula (A) where: Ra and Rb are aliphatic hydrocarbyl groups and may be the different; the lubricant composition further comprising from 0.5 to 7% of total dispersant additive, by weight of the lubricant composition. In some embodiments, the ether base stock has the formula (1) where: R1, R2, R3, R4, R5 and R6 are as defined herein. The lubricant composition may be used for lubricating a surface in an internal combustion engine as well as for improving the fuel economy performance and/or piston cleanliness performance of an engine and/or a vehicle, such as an automotive vehicle associated with an internal combustion engine.

Abstract: A method of preparing a lubricant composition comprising at least one base oil component, at least one first additive component and at least one second additive component which method comprises: introducing into an elongate mixing vessel comprising at least one static mixer, at least one base oil component, at least one first additive component and at least one second additive component; the at least one first additive component being introduced into the mixing vessel separately from the at least one second additive component; and mixing the at least one second additive component with a mixture of the at least one first additive component and the at least one base oil component in the elongate mixing vessel using the at least one static mixer.

Abstract: Apparatus and method for adding one or more additives to an engine lubricant, while the lubricant is circulating within an engine having an engine lubricant filter with a by-pass valve which opens when the pressure of the lubricant passing through the filter exceeds a pre-determined back-pressure value in which the apparatus further comprises an additive chamber containing one or more additives operably connected to the by-pass valve such that when the by-pass valve opens at the pre-determined back-pressure, at least some of the lubricant is caused to flow through the additive chamber and contact the one or more additives.

Abstract: The invention relates to a method of operating a hybrid internal combustion engine, which method comprises: fuelling said hybrid internal combustion engine with a combustible fuel; lubricating said engine with an engine oil composition; and maintaining an oil film thickness of the engine oil composition in the big end conrod bearing shells of the engine of at least 0.4 ?m; in which the temperature of the engine oil composition is maintained below 123° C. and the engine oil composition has: a high temperature, high shear viscosity of less than 2.6 cP (2.6 millipascal second) at 150° C. and at a shear rate of 106 s?1; a Noack volatility of at most 13 weight %; and comprises: (A) a base oil which is at least one synthetic basestock, the base oil having a kinematic viscosity of at least 2.0 cSt (2.0 mm2/s) at 100 ° C.

Abstract: A method of operating a compression ignition internal combustion engine which comprises supplying the engine with an aqueous ethanol fuel and lubricating the engine with a lubricating oil composition which mitigates problems of interaction between the oil composition and the fuel, the lubricating oil composition comprising a major amount of a base oil of lubricating viscosity and a minor amount of additives comprising one or more nitrogen-containing dispersant additives and one or more neutral or over-based, metal salt-containing detergent additives, the metal salt-containing detergent additives being present in the lubricating oil composition at a total metal salt concentration in the lubricating oil composition of greater than 0 and up to 1% by weight and the weight ratio of the total amount of nitrogen in the dispersant additives:the total amount of metal salt in the detergent additives being, at least 0.1:1.

Abstract: A multigrade lubricating oil composition with enhanced anti-wear properties for use in an internal combustion engine comprises (a) a base oil comprising at least 90% by weight of the base oil, of one or more basestocks selected from the group consisting of base stocks derived from Fischer-Tropsch synthesised, waxy, paraffinic hydrocarbon material by processes comprising hydrocracking and/or hydroisomerisation, Group II basestocks, Group III basestocks and mixtures thereof; (b) one or more dispersant viscosity modifiers in a total amount of 0.15 to 0.8% by weight of the composition; (c) one or more dispersants in a total amount of active dispersants of 1.5 to 3% by weight of the composition; (d) one or more detergents; and (e) one or more metal dihydrocarbyl dithiophosphates.

Abstract: Apparatus and method for adding one or more additives to an engine lubricant, whilst the lubricant is circulating within an engine having an engine lubricant filter with a by-pass valve which opens when the pressure of the lubricant passing through the filter exceeds a pre-determined back-pressure value in which the apparatus further comprises an additive chamber containing one or more additives operably connected to the by-pass valve such that when the by-pass valve opens at the pre-determined back-pressure, at least some of the lubricant is caused to flow through the additive chamber and contact the one or more additives.

Abstract: Disclosed is a lubricating composition having a major amount of an oil of lubrication viscosity and a minor amount of (A) a nitrogen containing dispersant with a total base number of from 20 to 160 on an oil-free basis wherein the improvement comprises adding to said dispersant; (B) a sludge preventing/seal protecting additive of at least one aldehyde or epoxide or mixtures thereof.

Abstract: Disclosed is a lubricating composition having a major amount of an oil of lubrication viscosity and a minor amount of(A) at least one thiocarbamate wherein the improvement comprises adding to said thiocarbamate(B) a sludge preventing and seal protecting amount of at least one aldehyde or epoxide or mixtures thereof.