Environmental Assessment of Heavy Metals in New and Used Engine Oils: A Case Study from Benghazi, Libya. The International Journal for Scientific Research, [S. l.], v. 5, n. 8, 2026. DOI: 10.59992/IJSR.2026.v5n8p21. Disponível em: https://vsrp.co.uk/index.php/ijsr/article/view/1846. Acesso em: 31 aug. 2026.