E. A. Hidayat, S. Sukardi, N. N. Afiyah, and Z. Randhi, “Lubricant-Engine Suitability Evaluation for Fuel Efficiency in Fishing VesselUsing Temperature and Color Degradation”, Jurnal Marfis, vol. 17, no. 2, pp. 131–142, Oct. 2026, doi: 10.29244/8sby2a58.