Ramos , Eudes, Tadeu Pinto Junior, Raimundo Silva, Gizele Uchoa, Vanise Rodrigues, and Greyce Rodrigues. 2017. “Comparative Study of Synthetic and Semi-Synthetic Lubricating Oils and Their Lubricating Capacities”. ITEGAM-JETIA 2 (8). http://br940.teste.website/~itegamjetia/journal/index.php/jetia/article/view/147.