Abstract : Diesel engines are widely used in transportation, power, and industrial sectors due to their greater reliability, durability, and sturdiness compared to gasoline engines. The rapid population growth critically impacts petroleum reserves, leading to resource depletion. Consequently, the increasing demand for energy necessitates the immediate development of alternative renewable fuels. The B20 (Palm stearin) with Multiwall carbon nano tube blend was uniformly mixed using an ultrasonicator. The experiment seeks to assess emissions and assess the performance implications of employing exhaust gas recirculation (EGR) in conjunction with biodiesel B20MEPS blended with 50 ppm of multiwalled carbon nanotube (MWCNT) and diesel across various EGR levels (5%, 10%, 15%, and 20%) under different loads. Introducing MWCNT with EGR decreases nitrogen oxides by 20% compared to scenarios without EGR, while enhancing performance by 5%. Specifically, the combustion performance at 5% EGR surpasses that at other EGR percentages.