A lubricant composition comprising (a) an oil of lubricating viscosity; (b) a (meth)-acrylate-containing polymer comprising a multiplicity of arms containing at least 20 carbon atoms, said arms being attached to a multivalent organic moiety; and (c) an ethylene/olefin copolymer having a weight average molecular weight of about 10,000 to about 250,000, wherein the copolymer comprises about 40 to about 70 weight percent polymerized ethylene monomers and optionally further comprises polymerized propylene monomers; exhibits good viscometric and antiwear properties.

A lubricant composition comprising (a) an oil of lubricating viscosity; (b) a (meth)-acrylate-containing polymer comprising a multiplicity of arms containing at least 20 carbon atoms, said arms being attached to a multivalent organic moiety; and (c) an ethylene/olefin copolymer having a weight average molecular weight of about 10,000 to about 250,000, wherein the copolymer comprises about 40 to about 70 weight percent polymerized ethylene monomers and optionally further comprises polymerized propylene monomers; exhibits good viscometric and antiwear properties.

A lubrication product used in the packings and plungers of hydraulic pumps used in fracking and other oilfield applications. The composition including: 1) diluent oil, comprising of naphthenic, paraffinic, or synthetic origin ranging from 60 SUS to 3000 SUS at 100 F.; 2) olefin co-polymers, either high propylene or high ethylene, or combinations thereof; 3) polybutene, ranging in molecular weights from 100-6000 4) high molecular weight poly-ISO-Butylene, ranging from 500,000 to 3,000,000; 5) PIBSA dispersant; 6) performance additives, containing anti-wear and extreme pressure properties. Most preferable is a sulfur/phosphorus gear oil package.

A lubrication product used in the packings and plungers of hydraulic pumps used in fracking and other oilfield applications. The composition including: 1) diluent oil, comprising of naphthenic, paraffinic, or synthetic origin ranging from 60 SUS to 3000 SUS at 100 F.; 2) olefin co-polymers, either high propylene or high ethylene, or combinations thereof; 3) polybutene, ranging in molecular weights from 100-6000 4) high molecular weight poly-ISO-Butylene, ranging from 500,000 to 3,000,000; 5) PIBSA dispersant; 6) performance additives, containing anti-wear and extreme pressure properties. Most preferable is a sulfur/phosphorus gear oil package.

A composition results from the mixture of at least one copolymer A resulting from the copolymerisation of at least one monomer functionalised by diol functions and at least one compound A2 comprising at last two boronic ester functions. They have rheological properties which are very varied according to the proportion of the A1 and A2 compounds used. The field is that of associative and exchangeable polymers.

An engine oil composition includes a star polymer (A) and a poly(alkyl (meth)acrylate) (B) as a viscosity index improver, and has a viscosity index of 185 to 230, the star polymer (A) having a star structure and having a weight average molecular weight of 100,000 to 1,000,000, the star structure being a structure in which polymer chains branch from a center of the polymer, the polymer chains being obtained by copolymerization and hydrogenation of an aromatic vinyl compound monomer and a conjugated diene monomer, the poly(alkyl (meth)acrylate) (B) having a weight average molecular weight of 200,000 to 600,000, the content (M.sub.A) of the star polymer (A) in the engine oil composition being 0.10 to 2.00 mass % based on the total mass of the engine oil composition, the content (M.sub.B) of the poly(alkyl (meth)acrylate) (B) in the engine oil composition being 0.50 to 6.00 mass % based on the total mass of the engine oil composition, and the ratio M.sub.A/M.sub.B being 0.10 to 1.00. The engine oil composition can significantly improve fuel efficiency, and is suitably used for a diesel engine.

An engine oil composition includes a star polymer (A) and a poly(alkyl (meth)acrylate) (B) as a viscosity index improver, and has a viscosity index of 185 to 230, the star polymer (A) having a star structure and having a weight average molecular weight of 100,000 to 1,000,000, the star structure being a structure in which polymer chains branch from a center of the polymer, the polymer chains being obtained by copolymerization and hydrogenation of an aromatic vinyl compound monomer and a conjugated diene monomer, the poly(alkyl (meth)acrylate) (B) having a weight average molecular weight of 200,000 to 600,000, the content (M.sub.A) of the star polymer (A) in the engine oil composition being 0.10 to 2.00 mass % based on the total mass of the engine oil composition, the content (M.sub.B) of the poly(alkyl (meth)acrylate) (B) in the engine oil composition being 0.50 to 6.00 mass % based on the total mass of the engine oil composition, and the ratio M.sub.A/M.sub.B being 0.10 to 1.00. The engine oil composition can significantly improve fuel efficiency, and is suitably used for a diesel engine.

In some embodiments, a lubricating oil includes at least 50 wt % of a base oil, based on total weight of the lubricating oil. The lubricating oil includes at least 0.1 wt % of a polypropylene homopolymer having a racemic dyad content of about 60% to about 99% and a number average molecular weight (by GPC DRI) of about 10,000 g/mol to about 250,000 g/mol, wherein a total amount of the base oil and the polypropylene homopolymer does not exceed 100 wt %.

In some embodiments, a lubricating oil includes at least 50 wt % of a base oil, based on total weight of the lubricating oil. The lubricating oil includes at least 0.1 wt % of a polypropylene homopolymer having a racemic dyad content of about 60% to about 99% and a number average molecular weight (by GPC DRI) of about 10,000 g/mol to about 250,000 g/mol, wherein a total amount of the base oil and the polypropylene homopolymer does not exceed 100 wt %.