The book entitled "Enhancing Nano Additive Oils: Rheological & Tribological Optimization" is structured into 4 chapters: Study of vegetable lubricants used as additives, rheological behavior of lubricants based on soybean oil, nano additives, tribological performance and rheological properties of engine oil with graphene nano-additives, and optimization of the rheological properties and tribological performance of SAE 5w-30 base oil with added MWCNTs. Chapter 1 includes the subchapters: SWOT analysis of vegetable oil-based lubricants, nano additives for lubricants, and research in the field of vegetable oils. Chapter 2 includes the subchapters: the goal, experimental test stand, experimental methodology, results on the dependence of viscosity on shear rate, variation of dynamic viscosity with temperature, and modeling the dependence of dynamic viscosity with temperature. Chapter 3 includes the subchapters: introduction, experimental procedures, materials, characterization of the GNs, nanolubricant processing and testing equipment, rheological and tribological examinations, measurement properties, kinematic viscosity measurement, results, and discussions.