Present days Nano coatings envelop various benefits over other traditional coatings, track the nano meter (nm) scale structure and synthesis to control the products due to one of the ultra low-size properties. The significant difficulties confronting preceded with development of nanotechnology based coatings are scattering, characterization, material cost, health and safety. Cutting edge advancements have focused on the low emission, higher performance and efficiency of engine applications. This review considers the fundamental outcomes accomplished up to now, and is centered around the issue looking in emissions of the engine with nano coating worked on bio-diesel blends. © 2021 Elsevier B.V., All rights reserved.