A grease composition comprising a lubricating base oil and a thickener, which thickener comprises an ester-terminated oligomer and a polymer. The polymer is a polyolefin. The ester-terminated oligomer has the general formula: R1O[COR2CONHR3NHCOR2CO].sub.nOR1. R1 each independently represent a hydrocarbon group containing 4-22 carbon atoms. R2 represents a hydrocarbon group containing 4-42 carbon atoms. R3 represents a hydrocarbon group containing 2-9 carbon atoms. n represents an integer in the range of 1-20. A method for preparing the present grease composition. The present grease composition can be used for (a) lubricating a mechanical component having a metal surface and (b) protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

A grease composition comprising a lubricating base oil and a thickener, which thickener comprises an ester-terminated oligomer and a polymer. The polymer is a polyolefin. The ester-terminated oligomer has the general formula: R1O[COR2CONHR3NHCOR2CO].sub.nOR1. R1 each independently represent a hydrocarbon group containing 4-22 carbon atoms. R2 represents a hydrocarbon group containing 4-42 carbon atoms. R3 represents a hydrocarbon group containing 2-9 carbon atoms. n represents an integer in the range of 1-20. A method for preparing the present grease composition. The present grease composition can be used for (a) lubricating a mechanical component having a metal surface and (b) protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

A grease composition comprising a thickener and a lubricating base oil, wherein the lubricating base oil has a viscosity in the range of from 5-1000 cSt (at 40 C.). The thickener is present in an amount of 5-40 wt. %, based on total weight of the grease composition. The thickener comprises an ester terminated oligomer which has the general formula: R1-O[COR2-CONHR3-NHCOR2-CO]n-OR1. R1 represents a hydrocarbon group containing 4-22 carbon atoms. R2 represents a hydrocarbon group containing 4-42 carbon atoms. R3 represents a hydrocarbon group containing 2-9 carbon atoms. n represents an integer in the range of 1-20. The weight ratio between the lubricating base oil and the ester terminated oligomer (oil/oligomer) is larger than 1. The grease composition can be used for lubricating a mechanical component having a metal surface and/or for protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

A grease composition comprising a thickener and a lubricating base oil, wherein the lubricating base oil has a viscosity in the range of from 5-1000 cSt (at 40 C.). The thickener is present in an amount of 5-40 wt. %, based on total weight of the grease composition. The thickener comprises an ester terminated oligomer which has the general formula: R1-O[COR2-CONHR3-NHCOR2-CO]n-OR1. R1 represents a hydrocarbon group containing 4-22 carbon atoms. R2 represents a hydrocarbon group containing 4-42 carbon atoms. R3 represents a hydrocarbon group containing 2-9 carbon atoms. n represents an integer in the range of 1-20. The weight ratio between the lubricating base oil and the ester terminated oligomer (oil/oligomer) is larger than 1. The grease composition can be used for lubricating a mechanical component having a metal surface and/or for protecting a mechanical component having a metal surface against corrosion, wear and/or fretting.

A lubricant composition is provided that has reduced deposit formation and a low evaporation allowing for improved performance in high temperature applications relative to conventional high temperature lubricants. The high temperature lubricant composition includes a base oil, wherein the base oil includes at least one polyol ester and at least one pyromellitate ester. In some embodiments, the lubricant composition further includes one or more additives selected from the group of an extreme-pressure additive, an anti-wear additive, an anti-rust additive, a corrosion inhibitor, and an antioxidant, or a combination thereof. Further provided are methods for lubricating an apparatus using the lubricant composition, methods for improving the operational lubrication of a conventional high temperature lubricant, and methods of preparing the high temperature lubricant composition of the present invention.

Disclosed is a lubricating oil composition containing a base oil, a viscosity index improver, a molybdenum-based friction modifier, a boron-containing dispersant, and at least two extreme-pressure additives selected from a sulfur-based extreme-pressure additive, a phosphorous-based extreme-pressure additive and a sulfur/phosphorus-based extreme-pressure additive, or a sulfur/phosphorus-based extreme-pressure additive. The base oil is a synthetic oil having a kinematic viscosity at 100 C. of 3 mm.sup.2/s or more and 10 mm.sup.2/s or less, the viscosity index improver is a resin having a number average molecular weight (Mn) of 1,000 or more and 10,000 or less, the mass ratio of boron atoms (B) contained in the boron-containing dispersant to molybdenum atoms (Mo) contained in the molybdenum-based friction modifier, [(B)/(Mo)] is 1 or more and 5 or less, and the mass ratio of sulfur atoms (S) to phosphorus atoms (P) contained in the extreme-pressure additive(s), [(S)/(P)] is 10 or more and 20 or less.

Disclosed is a lubricating oil composition containing a base oil, a viscosity index improver, a molybdenum-based friction modifier, a boron-containing dispersant, and at least two extreme-pressure additives selected from a sulfur-based extreme-pressure additive, a phosphorous-based extreme-pressure additive and a sulfur/phosphorus-based extreme-pressure additive, or a sulfur/phosphorus-based extreme-pressure additive. The base oil is a synthetic oil having a kinematic viscosity at 100 C. of 3 mm.sup.2/s or more and 10 mm.sup.2/s or less, the viscosity index improver is a resin having a number average molecular weight (Mn) of 1,000 or more and 10,000 or less, the mass ratio of boron atoms (B) contained in the boron-containing dispersant to molybdenum atoms (Mo) contained in the molybdenum-based friction modifier, [(B)/(Mo)] is 1 or more and 5 or less, and the mass ratio of sulfur atoms (S) to phosphorus atoms (P) contained in the extreme-pressure additive(s), [(S)/(P)] is 10 or more and 20 or less.

This invention is a composition of an ester resulting from the reaction of an oligomer of ethylene oxide in presence or a catalyst, with fatty acids. The resulting water based metal working fluid additive is useful as it imparts property of stable micro-emulsion and helps improving the wear life, coefficient of friction and other tribological properties among other uses.

A method of performing a cleanup service on an internal combustion engine. The method involves draining used fleet oil from the engine, filling the engine with cleanup oil, draining the cleanup oil after an operation interval, and filling the engine with fresh fleet oil. The method can be performed as a remedial measure for an engine already exhibiting high oil consumption, or as a preventative measure on a healthy engine.

A method of performing a cleanup service on an internal combustion engine. The method involves draining used fleet oil from the engine, filling the engine with cleanup oil, draining the cleanup oil after an operation interval, and filling the engine with fresh fleet oil. The method can be performed as a remedial measure for an engine already exhibiting high oil consumption, or as a preventative measure on a healthy engine.