Zulkarnain, A., Saefullah, D. B., Pratiwi, D. I., Perwira, D. A., Dwipayana, A. D., & Arifin, T. S. P. (2025). Feasibility study of engine oil concerning the kinematic viscosity, water contamination, and dissolved solids pollutants on locomotive CC 206. Jurnal Pendidikan Teknologi Dan Kejuruan, 31(1), 15–28. https://doi.org/10.21831/jptk.v31i1.81436