Research of the main technical and operational indicators of the D21F1 engine in the process of using SME-based biodiesel fuel. ADVANCES IN MECHANICAL ENGINEERING AND TRANSPORT, [S. l.], v. 1, n. 26, 2026. DOI: 10.36910/8fnhh504. Disponível em: https://eforum.lntu.edu.ua/index.php/jurnal-mbf/article/view/2212. Acesso em: 24 jun. 2026.