BERTINATTO, R.; FRIEDRICH, L.; BARICCATTI, R. A.; SOUZA, S. N. M. de; GURGACZ, F.; PAZUCH, F. A. <b>Analysis of lubricant oil contamination and degradation and wear of a biogas-fed otto cycle engine. Acta Scientiarum. Technology, [S. l.], v. 39, n. 4, p. 409–416, 2017. DOI: 10.4025/actascitechnol.v39i4.29458. Disponível em: https://periodicos.uem.br/actascitechnol/index.php/ActaSciTechnol/article/view/29458. Acesso em: 27 set. 2025.