The disposal of both used mineral and vegetable oils is one of the main environmental problems. Actually, uncontrolled disposal seriously damages the sewage system, blocks pipes and causes unbalance to the aquatic ecosystem. In this study, spent mineral oil was used in the production of grease while spent vegetable oil was transformed into soap, which was incorporated in the production of grease. The specifications of the manufactured grease were compared with those of commercial grease. The processing parameters were investigated to achieve the highest quality of grease together with a maximum yield and better.