Abstract: Disclosed are compositions of a major amount of alkylated aromatics compounds, in particular alkylated naphthalene and alkylated benzene, optionally combined with API Group II, Group III, Group IV and/or ethylene copolymers, showing improved thermo-oxidation performance when containing an additive combination including an alkylated or non-alkylated diarylamine and a sulfur-containing metal passivator. Particularly, the lubricating compositions include at least 55 wt % of a base oil selected from the group consisting of alkylated naphthalene, alkylated benzene and combinations thereof, and from 0 wt % to 45 wt % of another base oil component. The ratio of amine component to sulfur component in the additive combination is from 1:1 to 20:1. The compositions contain an amount of base oil other than alkylated naphthalene, alkylated benzene and API Group II, Group III, Group IV and/or ethylene copolymers of less than 10 wt % based on the total weight of the components comprising the lubricating composition.

Abstract: The lubricating composition of this invention is primarily comprised of an admixture of an API Group V base oil component and a polyolefin base oil component. In general, the blend components include at least 45 wt. % of a Group V base oil component having a kinematic viscosity of less than 20 cSt at 100° C., and from 10 wt. % to 60 wt. % of a polyolefin base oil component having a kinematic viscosity of at least 500 cSt and not greater than 4000 cSt at 100° C. The lubricating composition has improved efficiency and lower operating temperatures, comparable to polyalkylene glycol-based lubricant level, which provides improved machine life and seal life, relative to other lubricating compositions.

Abstract: A method for improving thermo-oxidative stability and elastomer compatibility in an apparatus lubricated with a lubricating oil by using as the lubricating oil a formulated oil including a lubricating oil base stock. The lubricating oil base stock includes a di-alkylated aromatic base stock of the formula: (R1)—(R2)—(R1) wherein each R1 is the same or different and represents a C10-C30 alkyl group; R2 represents an aromatic moiety. The di-alkylated aromatic base stock includes at least 44 wt % dialkylate product. Thermo-oxidative stability and elastomer compatibility are improved as compared to thermo-oxidative stability and elastomer compatibility achieved using a lubricating oil base stock other than the di-alkylated aromatic base stock. A lubricating oil including the di-alkylated base stock of the above formula, and the di-alkylated aromatic base stock of the above formula.

Abstract: Disclosed are compositions of a major amount of alkylated aromatics compounds, in particular alkylated naphthalene and alkylated benzene, optionally combined with API Group II, Group III, Group IV and/or ethylene copolymers, showing improved thermo-oxidation performance when containing an additive combination including an alkylated or non-alkylated diarylamine and a sulfur-containing metal passivator. Particularly, the lubricating compositions include at least 55 wt % of a base oil selected from the group consisting of alkylated naphthalene, alkylated benzene and combinations thereof, and from 0 wt % to 45 wt % of another base oil component. The ratio of amine component to sulfur component in the additive combination is from 1:1 to 20:1. The compositions contain an amount of base oil other than alkylated naphthalene, alkylated benzene and API Group II, Group III, Group IV and/or ethylene copolymers of less than 10 wt % based on the total weight of the components comprising the lubricating composition.

Abstract: The lubricating composition of this invention is primarily comprised of an admixture of an API Group V base oil component and a polyolefin base oil component. In general, the blend components include at least 45 wt. % of a Group V base oil component having a kinematic viscosity of less than 20 cSt at 100° C., and from 10 wt. % to 60 wt. % of a polyolefin base oil component having a kinematic viscosity of at least 500 cSt and not greater than 4000 cSt at 100° C. The lubricating composition has improved efficiency and lower operating temperatures, comparable to polyalkylene glycol-based lubricant level, which provides improved machine life and seal life, relative to other lubricating compositions.