Abstract: A grease composition contains a base oil, a thickener, and a conductive additive (A), the base oil is a trimellitic acid ester, the conductive additive (A) is a mixture containing sepiolite and bentonite and is an organically modified additive, and an amount of the conductive additive (A) with respect to a total amount of the base oil, the thickener, and the conductive additive (A) is 3 to 10 mass %.

Abstract: A grease composition including: a base oil; a thickener; a zinc sulfonate; a polysulfide; an overbased calcium sulfonate; and triphenyl phosphite, in which a proportion of the zinc sulfonate with respect to a total mass of the base oil and the thickener is 0.030 mass% to 0.045 mass% in terms of a zinc content, a proportion of the polysulfide with respect to the total mass of the base oil and the thickener is 0.16 mass% to 0.24 mass% in terms of a sulfur content, a proportion of the overbased calcium sulfonate with respect to the total mass of the base oil and the thickener is 0.010 mass% to 0.015 mass% in terms of a calcium content, and a proportion of the triphenyl phosphite with respect to the total mass of the base oil and the thickener is 0.24 mass% to 0.36 mass%.

Abstract: A grease composition includes base oil, a thickener, and an inorganic additive. The base oil is a poly-?-olefin having a base oil kinematic viscosity of 15 to 50 mm2/s at 40° C. The thickener is a diurea expressed by Structural Formula (1). The content of the thickener is 10 to 22 mass % with respect to the total amount of the base oil and the thickener. The inorganic additive is a mixture containing sepiolite and bentonite, and is organically modified. The content of the inorganic additive is 2 to 20 mass % with respect to the total amount of the base oil and the thickener.

Abstract: A grease composition includes a base oil, a thickener, and zirconium oxide particles. The base oil is a poly-?-olefin. The zirconium oxide particles have a median diameter D50 of 0.6 ?m to 4 ?m. A content of the zirconium oxide particles is 2% by mass to 15% by mass with respect to a total amount of the base oil and the thickener.

Abstract: 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.

Abstract: A grease composition includes base oil, a thickener, and an inorganic additive. The base oil is a poly-?-olefin having a base oil kinematic viscosity of 15 to 50 mm2/s at 40° C. The thickener is a diurea expressed by Structural Formula (1). The content of the thickener is 10 to 22 mass % with respect to the total amount of the base oil and the thickener. The inorganic additive is a mixture containing sepiolite and bentonite, and is organically modified. The content of the inorganic additive is 2 to 20 mass % with respect to the total amount of the base oil and the thickener.

Abstract: A grease composition includes base oil, a thickener, and an organic modified polysiloxane. The base oil is an alkyl diphenyl ether. The thickener is a urea thickener, and the grease composition contains 10 to 30 mass % of the thickener based on the total amount of the base oil and the thickener. The grease composition contains 0.2 to 10 mass % of the organic modified polysiloxane based on the total amount of the base oil and the thickener.