Hamidon, M. L. H. ., Jumadi, R. ., Khalid, A. ., Jaat, N. ., Salleh, H. ., & Samion, S. . (2023). Research On Biodegradable Lubricant in Combustion Engine . Journal of Automotive Powertrain and Transportation Technology, 2(2), 42-50. https://publisher.uthm.edu.my/ojs/index.php/japtt/article/view/13280