Provided is a polyol ester base stock composition with reduced odor and volatility. The polyol ester back stock composition does not include C5 acid. More particularly, the polyol ester base stock includes the reaction product of: (a) a polyol represented by the formula R(OH).sub.n wherein R is an aliphatic or a cyclo-aliphatic hydrocarbyl group and n is at least 2, and (b) a mixture of monocarboxylic acids comprising at least one linear acid selected from the group consisting of between C6 to C10 acids and at least one branched C6 acid, wherein the amount of C6 to C10 acids is at least 55 wt. % and the amount of the at least one branched C6 acid is 45 wt. % or less, based upon the total amount of said mixture of monocarboxylic acids. The polyol ester base stock is particularly suited for aviation turbine oils.

This disclosure relates to a low viscosity lubricating turbine oil having a composition comprising a lubricating oil base stock, as a major component, and one or more lubricating oil additives, as minor components. The lubricating turbine oil has a kinematic viscosity of about 16 cSt to about 22 cSt at 40 C., a density of about 0.8 g/ml to about 0.9 g/ml, and an absolute evaporation loss at 150 C. of less than about 4%. This disclosure also relates to a method for improving energy efficiency in a turbomachine lubricated with the low viscosity lubricating turbine oil. This disclosure further relates to a method for improving energy efficiency while maintaining or improving deposit control and lubricating oil additive solvency in a turbomachine lubricated with the low viscosity lubricating turbine oil. This disclosure yet further relates to a method for improving solubility, compatibility and dispersancy of polar additives in the low viscosity lubricating turbine oil.

This invention encompasses lubricating oil compositions comprising a base oil, a biodiesel fuel and a dispersant. A method for inhibiting viscosity increase in a diesel engine fueled at least in part with a biodiesel fuel is also described.

Provided herein are compositions comprising at least one estolide compound of formula:

##STR00001##

in which n is an integer equal to or greater than 0; m is an integer equal to or greater than 1; R.sub.1, independently for each occurrence, is selected from optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched; R.sub.2 is selected from hydrogen and optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched; and R.sub.3 and R.sub.4, independently for each occurrence, are selected from optionally substituted alkyl that is saturated or unsaturated, and branched or unbranched. Also provided are uses of the compositions described herein.

Provided is a lubricating oil for electric and hybrid vehicles. The lubricating oil includes at least 80 wt % of a lubricating base oil, 0.5 to 5 wt % of one or more dispersants, 0 to 4 wt % of one or more neutral metal detergents, 0 to 1.5 wt % of zinc dialkyldithiophosphate, 0 to 0.2 wt % of molybdenum dialkyldithiocarbamate, 0 to 2 wt % of an active viscosity modifier, and 0.01 to 5 wt % of one or more other lubricating oil additives. The lubricating oil is essentially free of overbased metal detergents. The lubricating oil has an electrical conductivity from 50 to 3,000 pS/m and a kinematic viscosity from 2 to 20 cSt at 100 C. This disclosure also relates to methods for producing the lubricating oil, methods for lubricating electric and hybrid vehicles, and methods for controlling electrical conductivity of a lubricating oil by using conductivity promoters and conductivity inhibitors.

Provided is a lubricating oil for electric and hybrid vehicles. The lubricating oil has a composition including at least 80 wt % of a lubricating base oil, from 0.8 to 5 wt % of one or more metal detergents, from 0 to 5 wt % of one or more dispersants, from 0 to 1.5 wt % of zinc dialkyldithiophosphate antiwear agent, from 0 to 0.2 wt % of a molybdenum dialkyldithiocarbamate, from 0 to 2 wt % of a viscosity modifier based on active ingredient, and from 0.01 to 5 wt % of other lubricating oil additives. The lubricating oil has an electrical conductivity from 3,000 to 20,000 pS/m, and kinematic viscosity from 2 to 20 cSt at 100 C. This disclosure also relates to methods for producing the lubricating oil, methods for lubricating electric and hybrid vehicles, and methods for controlling electrical conductivity of a lubricating oil by using conductivity promoters and conductivity inhibitors.

This disclosure relates to a lubricating oil for an electric vehicle powertrain and powertrain components. 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 about 10 pS/m to about 20,000 pS/m, a dielectric constant of about 1.6 to about 3.6, with a ratio of electrical conductivity-to-dielectric constant from about 5 to about 10,000. This disclosure also relates to methods for producing a lubricating oil for an electric vehicle powertrain and powertrain components.

Lubricating oil compositions comprise one or more polytetrahydrofuranes that are prepared by alkoxylating polytetrahydrofurane with at least one C8-C30 epoxy alkane.

Compositions having a plurality of hard particles and a plurality of lubricant nanoparticles are disclosed. Methods of making and using the compositions are also disclosed.

A method of using lubricant compositions to reduce wear between two surfaces exposed to a load condition of at least 1 GPa is provided. The lubricant compositions comprise polysiloxane base oils having alkylaryl or a combination of alkyl and aryl functionality. The polysiloxane base oils may be defined according to the formula: ##STR00001##
wherein R, R, and R are independently selected, such that R is an alkyl group having between 1-3 carbon atoms; R is an alkylaryl group comprising alkyl functionality with 3-12 carbon atoms and aryl functionality with 6 to 12 carbon atoms; R is an alkyl group having between 1-3 carbon atoms or an alkylaryl group comprising alkyl functionality with 3-12 carbon atoms and aryl functionality with 6 to 12 carbon atoms; and m and n are integers, such that 8<(m+n)<500.