Disclosed herein are marine diesel cylinder lubricating oil compositions comprising (a) a major amount of one or more Group II basestocks, and (b) a detergent composition comprising (i) one or more alkaline earth metal salts of an alkyl-substituted hydroxyaromatic carboxylic acid having a total base number (TBN) greater than 250, and (ii) one or more high overbased alkyl aromatic sulfonic acids or salts thereof; wherein the aromatic moiety of the alkyl aromatic sulfonic acids or salts thereof contains no hydroxyl groups; and wherein the marine diesel cylinder lubricating oil composition has a TBN of about 5 to about 120.

A lubricating oil composition may have excellent fuel economy and high shear stability. Such a lubricating oil composition may include: a comb-like polymer (A1) having a weight average molecular weight (Mw) of less than 300,000; and a comb-like polymer (A2) having a Mw of at least 400,000. The (A1)/(A2) mass content ratio of the comb-like polymer (A1) to the comb-like polymer (A2) in terms of resin content may be at least 0.25.

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.

A sliding member according to the present disclosure contains, in a sliding layer, a synthetic resin, a solid lubricant, and an additive. The synthetic resin is a polyimide, a polyamide imide, a polybenzimidazole, a polyphenyl sulfone, a polyether sulfone, a polyether ether ketone, or a combination thereof. The solid lubricant is a polytetrafluoroethylene, a tetrafluoroethylene-perfluoroalkoxyethylene copolymer, molybdenum disulfide, a tetrafluoroethylene-hexafluoropropylene copolymer, or a combination thereof. The contained amount of the solid lubricant in the sliding layer is 5.0-40.0 vol. %. The additive is bentonite, smectite clay mineral, silica, a polyamide, or a combination thereof. The contained amount of the additive in the sliding layer is 0.1-9.0 vol. %.

A lubricant oil, the use of a lubricant oil as an additive, and a method of lubricating parts in an engine are described herein. The lubricant oil is characterized as having one or more components with each of the components having a minimum evaporation rate when experiencing conditions within a combustion cylinder of the engine. The minimum evaporation rate is configured so that when at least a portion of the lubricant oil evaporates in combustion cylinder and locally mixes with the air fuel mixture around it, the concentration of the combustible components in that mixture is greater than the net upper flammability limit of the particular components of the combustible mixture. Thus, in some examples, when the pressure and/or temperature of the combustion cylinder volume are increased, such as during a compression cycle, the probability of a portion of the lubricant oil combusting or auto-igniting is preferably decreased.

A lubricating oil composition may have excellent fuel economy and high shear stability. Such a lubricating oil composition may include: a comb-like polymer (A1) having a weight average molecular weight (Mw) of less than 300,000; and a comb-like polymer (A2) having a Mw of at least 400,000. The (A1)/(A2) mass content ratio of the comb-like polymer (A1) to the comb-like polymer (A2) in terms of resin content may be at least 0.25.

Provided are paper machine lubricating compositions and methods of operating a paper machine with said paper machine lubricating compositions, where the paper machine lubricating compositions comprise about 20 wt % to about 80 wt % of a first oil basestock, wherein the first oil basestock comprises an API group II extra heavy neutral basestock, and about 2 wt % to about 40 wt % of a second oil basestock, wherein the second oil basestock comprises an API group I, an API group II, an API group IV basestock, or any combination thereof, where the API group II extra heavy neutral basestock has: a kinematic viscosity (ASTM D445, 40 C.) of 320 cSt to 520 cSt, a kinematic viscosity (ASTM D445, 100 C.) of 22 cSt to 36 cSt, a viscosity index (ASTM D2270) of 80 to 119, a pour point (ASTM D97) of 6 C. or less, and a saturate content (ASTM D7419) of 90 wt % or greater; and wherein the second oil basestock has a kinematic viscosity (ASTM D445, 40 C.) of 3 cSt to 50 cSt.

The present invention relates to the use of a composition comprising 1-methylheptyl laurate as a lubricant composition for transmissions.