A
grease composition comprising:(i) a mineral
base oil containing one or more of fatty
ammonium carboxylate salts of formula (I),wherein R1 is selected from C12 to C20 saturated or unsaturated, branched or straight-chain hydrocarbyl groups; X is selected from NH, +NH2 and N—(R4)—NH3+; R2 and R4 are independently selected from C2 to C8 saturated or unsaturated, branched or
straight chain hydrocarbyl groups, and may be the same or different; R3 is selected from C12 to C26 saturated or unsaturated, branched or straight-chain hydrocarbyl groups; and n is 1 or 2; and(ii) a simple
lithium soap thickener,wherein said lubricating
grease composition is prepared by a process comprising the steps of combining the mineral
base oil with the one or more fatty
ammonium carboxylate salts of formula (I) and then thickening said
base oil fatty
ammonium carboxylate salt mixture with the simple
lithium soap thickener.