Abstract: An enhanced biodegradable grease composition that is environmentally friendly, as well as several processes for preparing the grease composition is described which comprises(A) a base oil wherein the base oil is a natural oil or synthetic triglyceride of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are aliphatic groups that contain from about 7 to about 23 carbon atoms;(B) at least one performance additive comprising(1) an alkyl phenol,(2) a benzotriazole, or(3) an aromatic amine; and(C) a thickener wherein the thickener (C) is a reaction product of (C1) a metal based material and (C2) a carboxylic acid or its ester.The enhanced biodegradable lubricating grease may also contain (D) a viscosity modifier, (E) a pour point depressant, or mixtures of (D) and (E).