Provided is a non-Newtonian engine oil lubricant composition with improved fuel efficiency and engine wear protection. The lubricant composition includes a major amount of a base oil including a Group II base stock and an optional Group V base stock, from 0.1 to 9.0 wt. % of at least one viscosity modifier and from 0.1 to 1.2 wt. % of at least one friction modifier. The non-Newtonian engine oil lubricant composition has a kinematic viscosity at 100 deg. C. of less than or equal to 10 cSt and an HTHS (ASTM D4683) of less than or equal to 2.2 cP at 150 C. Also provided are methods of using the lubricant composition in internal combustion engines and methods of making the lubricant composition.

The present invention relates to a lubricant and/or clean-out composition comprising: (a) a dispersant component comprising a succinimide dispersant and/or a quaternary ammonium salt dispersant; (b) a carrier fluid component; and (c) an optional corrosion inhibitor, as well as methods of cleaning out deposits in a lubricant system, such as a hydraulic system, using such compositions.

This disclosure relates to a method for minimizing the electrical drainage of charged electrical powertrain components, a method for controlling electrical conductivity over a lifetime of a lubricating oil in an electric vehicle powertrain lubricated with the lubricating oil, and a method for obtaining a desired electrical conductivity-to-dielectric constant ratio of a lubricating oil for an electric vehicle powertrain and powertrain components. The methods relate to controlling at least one of oxidation, deposit formation and corrosion over the service lifetime of the oil. The lubricating oil has a composition including a lubricating base oil as a major component, an additive package, as a minor component, and an effective amount of one or more conductivity agents, as a minor component. The lubricating oil has an electrical conductivity from 10 pS/m to 20,000 pS/m, a dielectric constant of 1.6 to 3.6, with a ratio of electrical conductivity-to-dielectric constant from 5 to 10,000.

Gear oil compositions including a first oil basestock and a second basestock. The first basestock includes a Group II bright stock having a kinematic viscosity (ASTM D445, 40 C.) of from 250 mm.sup.2/s to 600 mm.sup.2/s, a kinematic viscosity (ASTM D445, 100 C.) of from 20 mm.sup.2/s to 70 mm.sup.2/s, a viscosity index (ASTM D2270) of from 80 to 120, and a pour point (ASTM D97) of from 50 C. to 20 C. The second basestock includes a polyalphaolefin (PAO) basestock having a kinematic viscosity (ASTM D445, 40 C.) of from 500 mm.sup.2/s to 3500 mm.sup.2/s, a kinematic viscosity (ASTM D445, 100 C.) of from 60 mm.sup.2/s to 300 mm.sup.2/s, a viscosity index (ASTM D2270) of from 150 to 250, and a pour point (ASTM D97) of from 50 C. to 20 C.

The invention provides lubricating composition comprising: (1) a reaction product selected from the group consisting of: (a) a polyalkanoic or polyalkenoic acid derived from hydroxyfatty acids and a block copolymer selected from the group consisting of polyoxyethylene-polyoxypropylene and a reverse block copolymer of polyoxypropylene-polyoxyethylene-polyoxypropylene; (b) the reaction product of (a) with a maleic acid or anhydride; and (c) the reaction product of (a) with maleated soybean oil; and (2) at least one base oil selected from the group consisting of alkyl benzene, normal paraffin, isoparaffin, mineral oil and -olefin.

A composition for a heat cycle system contains a working medium for heat cycle containing 1-chloro-2,3,3,3-tetrafluoropropene and a refrigerant oil.

Disclosed is a star copolymer (C) including at least 10 wt. % of units derived from styrene monomer and including arms that include a statistical copolymer (EP) including ethylene units and propylene units, and the method for preparing same. Also disclosed is the use thereof in lubricating compositions, in particular for improving the viscosity index, to the lubricating compositions thus obtained and to the uses thereof.

Disclosed are refrigerants comprising at least about 97% by weight of a blend of three compounds, said blend consisting of: from about 40% by weight to about 49% by weight difluoromethane (HFC-32), from about 6% by weight to about 12% by weight pentafluoroethane (HFC-125), from about 33% by weight to about 40% by weight trifluoroiodomethane (CF.sub.3I); and from about 2% by weight to about 12% by weight of trans 1,3,3,3-tetrafluoropropene (trans HFO-1234ze), wherein the percentages are based on the total weight of the three compounds in the blend, and systems and method using same.

A lubricating oil composition according to one embodiment of the present invention contains an oxygen-containing synthetic base oil having an oxygen content (A) of from 15 to 40 mass % and a kinetic viscosity at 100 C. of from 0.5 to 50 mm.sup.2/s, and a viscosity index improver that is an oxygen-containing compound having an oxygen content (B) of from 15 to 40 mass % and a kinetic viscosity at 100 C. of 11,000 mm.sup.2/s or more, a mass ratio of the oxygen-containing synthetic base oil and the viscosity index improver being from 99.5:0.5 to 75:25, and a ratio (A/B) of the oxygen content (A) of the oxygen-containing synthetic base oil to the oxygen content (B) of the viscosity index improver being in a range of from 0.5 to 2.

A lubricating oil composition for refrigerating machines contains a base oil and an additive in a form of a naphthalimide compound. A refrigerant used in a refrigerating machine in which the composition is used is unsaturated hydrofluorocarbon (unsaturated HFC) having a GWP of 1000 or less. When the present lubricating oil composition for refrigerating machines is used in refrigerating equipment such as an open-type automobile air-conditioner, an electric automobile air-conditioner, a gas heat pump, other air-conditioning equipment, a refrigerating machine, a vending machine, a showcase, a water-heating system and a refrigerating/heating system, it is possible to detect the leakage of a refrigerant with a long-lasting stability. Therefore, when an unsaturated fron refrigerant with a poor stability is used in the above-listed equipment, the present lubricating oil composition for refrigerating machines is significantly advantageous.