Numerous researchers are extremely concerned about the depletion of mineral oil caused by the decades-long production of commercial products such as grease. The issue may be resolved through the utilisation of waste cooking oil (WCO). Many individuals, due to a lack of environmental consciousness, inadequately dispose of the WCO that are the by-products of consuming fresh vegetable oil (VO). As a result, the objective of this research was to develop a grease made from WCO by employing a range of different amounts of sodium soap thickener (SST). At the beginning, SST was generated via a saponification process involving stearic acid and sodium hydroxide. The lubricant formulation immediately started with the treatment of WCO in order to remove any impurities present in the used oil. After that, the greases were made using a weight percentage ratio that included additives. They were then tested for dropping point value, oil bleeding value, oil separation value, consistency value, and rusting ability to find out what the grease is made of. In spite of this, the research findings indicate that every lubricant possesses an acceptable dropping point value, an NLGI value of 00-4, oil bleeding values ranging from -15% to 15% (SG40 being the exception), oil separation values falling below 4%, and corrosion test results classified within the mildly tarnish category. Nonetheless, SG60 was selected as the optimal lubricant due to the fact that it satisfies every one of the required criteria, rendering it the most refined option. This study indicates that WCO can be utilised as the base oil for greases on account of their satisfactory performance.