The invention provides a lubricant composition for an eccentric oscillating planetary gear type speed reducer comprising the following components (a) to (d): (a) a base oil containing a synthetic oil; (b) at least one calcium salt selected from the group consisting of calcium salts of petroleum sulfonic acids, calcium salts of alkyl aromatic sulfonic acids, calcium salts of salicylates, calcium salts of phenates, calcium salts of oxidized waxes, overbased calcium salts of petroleum sulfonic acids, overbased calcium salts of alkyl aromatic sulfonic acids, overbased calcium salts of salicylates, overbased calcium salts of phenates, and overbased calcium salts of oxidized waxes; (c) an antioxidant; and (d) a glycerin fatty acid ester.

The present disclosure is related to provide a lubricating grease composition having a high static friction coefficient while maintaining excellent low-temperature torque characteristics, high-temperature shear stability, and high-temperature oil separation characteristics. A lubricating grease composition of the present disclosure contains a base oil, a thickener, and a solid lubricant, wherein the solid lubricant is calcium carbonate, the amount of the calcium carbonate blended is 1 to 60% by weight based on the total weight of the lubricating grease composition, the calcium carbonate has an average particle diameter of 0.1 to 30 m, the base oil has a kinematic viscosity of 18 to 300 mm.sup.2/s at 40 C., and the lubricating grease composition has a worked penetration of 240 to 320.

The present disclosure is related to provide a lubricating grease composition having a high static friction coefficient while maintaining excellent low-temperature torque characteristics, high-temperature shear stability, and high-temperature oil separation characteristics. A lubricating grease composition of the present disclosure contains a base oil, a thickener, and a solid lubricant, wherein the solid lubricant is calcium carbonate, the amount of the calcium carbonate blended is 1 to 60% by weight based on the total weight of the lubricating grease composition, the calcium carbonate has an average particle diameter of 0.1 to 30 m, the base oil has a kinematic viscosity of 18 to 300 mm.sup.2/s at 40 C., and the lubricating grease composition has a worked penetration of 240 to 320.

Provided is a lubricating oil composition for a transmission having excellent gear properties, clutch properties, cooling properties, and electric insulating properties. The lubricating oil composition for a transmission preparing by blending (A) a base oil, (B) a viscosity index improver having a mass average molecular weight of 10,000 to 50,000, and (C-1) a polyamide and/or (C-2) a polyol ester, the base oil (A) including (A-1) a synthetic oil having a kinematic viscosity at 100 C. of 1.0 to 10.0 mm.sup.2/s.

A grease composition includes a base oil, a thickener, and polymethyl methacrylate particles. The base oil is a poly--olefin. The polymethyl methacrylate particles have an average particle size of 2 m to 7 m. A content of the polymethyl methacrylate particles is 10% by mass to 20% by mass with respect to a total amount of the base oil and the thickener.

A grease composition includes a base oil, a thickener, and polymethyl methacrylate particles. The base oil is a poly--olefin. The polymethyl methacrylate particles have an average particle size of 2 m to 7 m. A content of the polymethyl methacrylate particles is 10% by mass to 20% by mass with respect to a total amount of the base oil and the thickener.

This disclosure relates to cold cranking simulator viscosity (CCSV) boosting base stocks that allow flexibility for engine oil formulations to meet both high and low temperature viscosity requirements while maximizing fuel efficiency. The CCSV-boosting base stocks can include C28-C60 hydrocarbon materials, linear esters, tertiary amides, dialkyl carbonates, aromatic alcohols, and aromatic ethers. This disclosure also relates to lubricating oil formulations containing the CCSV-boosting base stocks, and a method for determining the CCSV-boosting efficacy of a base stock.

This disclosure relates to cold cranking simulator viscosity (CCSV) boosting base stocks that allow flexibility for engine oil formulations to meet both high and low temperature viscosity requirements while maximizing fuel efficiency. The CCSV-boosting base stocks can include C28-C60 hydrocarbon materials, linear esters, tertiary amides, dialkyl carbonates, aromatic alcohols, and aromatic ethers. This disclosure also relates to lubricating oil formulations containing the CCSV-boosting base stocks, and a method for determining the CCSV-boosting efficacy of a base stock.

The present invention relates to a Fischer-Tropsch derived residual base oil having a kinematic viscosity at 100 C. according to ASTM D445 in the range of from 15 to 35 mm.sup.2/s, an average number of carbon atoms per molecule Fischer-Tropsch derived residual base oil according to .sup.13C-NMR in a range of from 25 to 50.

The present invention relates to a Fischer-Tropsch derived residual base oil having a kinematic viscosity at 100 C. according to ASTM D445 in the range of from 15 to 35 mm.sup.2/s, an average number of carbon atoms per molecule Fischer-Tropsch derived residual base oil according to .sup.13C-NMR in a range of from 25 to 50.