The present work aims to find a viable substitute fuel for diesel and control pollutants from compression ignition engines. Therefore, in the present investigation, an attempt has been made to study the effect of 20 proportion of five different biodiesel diesel blends in diesel engine. The 20 proportion of biodiesel such as Jatropha, Pongamia, Mahua, Annona and Nerium and 80 of diesel is denoted as J20, P20, M20, A20 and N20 are used in the present investigation. The experimental results showed that the different biodiesel blends� brake thermal efficiency is slightly lower compared to neat diesel fuel. However, the N20 blend has shown improvement in performance and reduction in exhaust emissions compared to other biodiesel diesel blends. From, the experimental work, it is found that biodiesel can be used up to 20 and 80 of a diesel engine without any major modification. © 2022 Engineers Australia.