The present invention relates to a lubricating oil composition containing: (A) a poly-α-olefin base oil obtained by using a metallocene catalyst; (B) a mineral oil-based base oil exhibiting a distillation curve with a temperature gradient Δ|Dt| of distillation temperature between two points 2.0 vol % and 5.0 vol % of distillation amount being 6.8° C./vol % or less; and (C) an ester-based base oil in an amount of 6% by mass or more based on a total amount of the composition.

An automotive axle includes a housing including gears and a bath lubricating the gears, the bath including gear oil and about 0.1 to 5 wt. % secondary alcohol ethoxylate based on total weight of the bath such that during automotive operation at temperatures less than a threshold, reverse micelles form to trap air bubbles in the bath, emulsifying the bath, and at temperatures greater than the threshold, the reverse micelles dissipate.

A hydrocarbon fluid is disclosed that has a pour point of at most −30° C., as measured by ASTM D5950, and that comprises at least 99 wt % of naphthenes and paraffins, based on the total weight of the hydrocarbon fluid, wherein the weight ratio of naphthenes to paraffins is at least 1, as measured by GC-MS, and wherein the paraffins consist essentially of isoparaffins, as determined by GC-FID. In addition, preferred uses of said hydrocarbon fluid are disclosed.

A defoaming agent obtainable by a process that includes: polymerizing (A) at least one polymerizable monomer in a composition, the composition comprising (C) a solvent and (B) at least one non-polymerizable polysiloxane dissolved in the (C) solvent, wherein the component (A) optionally comprises at least one Si-atom-containing monomer in an amount of less than 10 mass % on the basis of the total mass of the component (A).

There is disclosed an antifoam component for a mechanical device which includes a fluorinated poly(acrylate) copolymer. The antifoam component has improved foam performance and thermal stability in finished fluids, such as driveline fluids.

A lubricant composition comprising a base oil; at least one additive; and 0.001-10% by weight, based on the total weight of the lubricant composition, of an organic compound comprising both a polar moiety and a nonpolar moiety, as lubricity improver, wherein the organic compound has a relative permittivity ε.sub.r in the range from 1.5 to 10, and a quotient ∫S.sub.1/∫S.sub.2 for the organic compound is in the range from 1 to 25, wherein ∫S.sub.1 denotes the sum total of the area(s) of the IR absorption band(s) in the wavenumber range of 3100-2750 cm.sup.−1 in an ATR spectrum of the organic compound, and ∫S.sub.2 denotes the sum total of the area(s) of the IR absorption band(s) in the wavenumber range of 1800-1650 cm.sup.−1 in an ATR spectrum of the organic compound.

Compositions prepared from an adduct of mono-maleated polyunsaturated vegetable oil and an alcohol mixture comprising a hydrophobic alcohol having at least 9 carbon atoms and methoxypolyethylene glycol having a number average molecular weight (M.sub.n) of at least 350. Metalworking fluids comprising less than 3 wt % of a composition that is an adduct of mono-maleated polyunsaturated vegetable oil and an alcohol mixture comprising an alcohol having at least 2 carbon atoms and methoxypolyethylene glycol having a number average molecular weight (M.sub.n) of at least 350. Methods of improving the stability and/or lubricity of a metalworking fluid using a composition that is adduct of mono-maleated polyunsaturated vegetable oil and an alcohol mixture comprising an alcohol having at least 2 carbon atoms and methoxypolyethylene glycol having a number average molecular weight (M.sub.n) of at least 350.

A lubricating composition including a polymer blend of a modified styrene-maleic anhydride copolymer and poly(meth)acrylate copolymer effective to maintain a pumpable fluid at low temperatures.

An additive package is disclosed for preparing an automotive crankcase lubricating oil composition for an internal combustion engine. The additive package is made by admixing: (i) 50 mass % or less of an oil of lubricating viscosity; (ii) 50 mass % or less of at least one overbased metal detergent, preferably at least one overbased metal hydroxybenzoate detergent; (iii) 50 mass % or less of an oil-soluble block or graft co-polymer of at to least one polymeric block A which is derived from a hydroxycarboxylic acid and at least one polyalkylene block B which is a residue of a polyalkylene glycol, and (iv) optionally, at least one further additive selected from a dispersant, an antioxidant and/or an antiwear agent.

The additive package includes less than 2.00 mass % preferably less than 1.50 mass %, of a friction modifier which is a monoester of a C.sub.5 to C.sub.30 carboxylic acid and which is free of nitrogen.

Component (ii) is preferably an overbased metal hydroxybenzoate detergent.

Component (iii) acts as a friction modifier and can be used as a replacement for a friction modifier such as glycerol monooleate.

The additive package exhibits improved stability.

A lubricating oil composition may have excellent long-term anti-foaming performance and detergency while blending a silicone-based anti-foaming agent. Such a lubricating oil composition may contain a base oil (A) and a silicone-based anti-foaming agent (B). A silicon atom content may be 50 ppb by mass to 4,000 ppb by mass, based on a total amount of the lubricating oil composition.