A water-based lubricating grease composition includes at least 40 wt % water; a salt-based thickener; a polymer-based thickener; and optionally, an inorganic solid-based thickener. A process for preparing the water-based lubricating grease composition may include blending a suitable amount of water with a salt-based thickener to provide a thickened water-based grease, wherein the salt-based thickener is obtained from contacting a base with a fat; and adding a polymer-based thickener to the thickened water-based grease.

A lubricant composition comprises a base oil and at least one of carbon nanotubes with a diameter of 0.4 to 9.0 nm in an amount of 0.001 to 0.08% by mass relative to a total mass of the composition, and the composition has a consistency of 200 to 440.

A lubricant grease is described comprising at least one base oil, at least one main thickening agent, and optionally one or more additives comprising a second thickening agent in smaller quantities than said main thickening agent and a polymer additive, wherein said main thickening agent is one or more spent bleaching earths, and is present in a quantity up to 80%-90% by weight relative to the weight of the total composition of the grease, and wherein the base oil is fossil oil or oil of biological origin, renewable oil and/or biodegradable oil, or combinations thereof, preferably Group I mineral base oils (GPI), said lubricant grease being an infusible grease and classifiable according to the NLGI scale.