The impact on the diesel engine of different EGR ratios such as 10, 15, 20, and 25% was examined with PSOME20 blend. The BTE of PSOME20 with different EGR ratios was lower than PSOMEE20 without EGR condition. The BTE of PSOME20 with 20% and 25% EGR is decreased by 1.1, and 1.8%, respectively, when compared to PSOME20 without EGR condition at full load. BSFC obtained for diesel and PSOME20, whereas the BSFC obtained with EGR setup of also increased gradually at maximum load. EGR setup gives 490, 480, 463, and 420 °C, respectively. The lower exhaust gas temperature could be attributed to EGR setup as faster combustion as well as its high latent heat of vaporization property. The CO emission was increased for PSOMEE20 with 10, 15, 20, and 25% EGR rates by 10, 21, 28, and 37.5% correspondingly when associated with PSOME20 without EGR at fully loaded. The NOx emissions were diminished by 9, 31, 44, and 49% for PSOME20 with 10, 10, 15, 20, and 25% EGR rate correspondingly when associated to PSOME20 without EGR condition. The smoke emissions remained to improve by 17, 27, 34, and 44% for PSOME20 with 10, 15, 20, and 25% EGR rate, respectively, when compared to PSOME20 without EGR condition. © 2024 Elsevier B.V., All rights reserved.