In another study, CuO and TiO\({}_{2}\) nanoparticles were incorporated into a metal-working polymeric lubricant, leading to an overall improvement in tribological properties. The addition of 0.01 wt% TiO\({}_{2}\) and 0.05 wt% CuO demonstrated the highest anti-wear properties with improvements of 77% and 33%, respectively, indicating the potential of nano lubricants for enhancing mechanical component efficiency [26]. [PERSON] et al. examined the tribological properties of CuO nanoparticles in lubricating oil using a pin-on-disc friction and wear tester. The experimental results demonstrated a remarkable reduction of 60.83% in wear rate and 33.1% in friction coefficient compared to the base oil when the concentration of CuO nanoparticles was 0.75 wt%. These findings indicate the potential of CuO nanoparticles as an effective additive in lubricating oils to enhance their tribological performance and reduce friction and wear in various mechanical systems [27]. Other studies have also demonstrated that the presence of metal oxide nanoparticles leads to a decrease in viscosity, as these oxides naturally enter the lubrication area as a result of corrosion. These studies have further explored the impact of nano additives on specific lubricating properties of various industrial oils [28; 29; 30; 31; 32; 33]. The results of these investigations suggest that the incorporation of metal oxide additives can enhance the lubricating characteristics of the oil and extend the durability of machine components. However, the impact of these additives on the load-carrying capacity of the oil has not been thoroughly explored. Hence, exploring the load-carrying capability of oil blends containing fly-ash additives may provide a potential solution to modify viscosity or stabilize the operational conditions of machine parts. This is particularly significant when assessing the lubrication effectiveness of heavy-duty machinery operating in demanding industrial environments. Fly ash consists of superfine spherical particles composed of silica oxide and other metal oxides, with particle sizes ranging from nano to micro. These nanoparticles are derived from the dust generated in thermal power plants, which is a byproduct of coal combustion in furnaces. To enhance the load-carrying capacity of industrial lubricating oil, a proposal has been made to incorporate a modifying additive sourced from fly ash obtained from thermal power plants. The fly ash additive will be incorporated into the lubricating oil mixture at a concentration of approximately 0.5-1%, leading to the formulation of an industrial lubricant blend enriched with nano/microelements. The optimal dosage of the additive will be carefully examined and optimized to enhance the viscosity, thermal conductivity, and durability of the lubricating oil mixture. Furthermore, this approach aims to reduce emissions of oil residue, contribute to sustainable development, and mitigate the environmental impact associated with oil refining and lubricant waste. In this study, three types of lubricating oils were examined and evaluated for various lubricating properties under different temperature conditions. Additionally, fly-ash additives at a concentration of 0.5% were introduced into these oils to assess the impact of additives on the lubricating characteristics of the oil-additive mixture. Based on these findings, careful consideration and selection of the most suitable oil and additive were made according to the predetermined operating conditions to enhance the oil's viscosity or thermal stability.