Mohamed, Norirda, Muhammad Luqman Haikal Hamidon, Rozita Jumadi @ Juri, Amir Khalid, Norrizam Jaat, Hamidon Salleh, and Syahrullail Samion. 2022. “Analysis of the Biodegradable Lubricant in Internal Combustion Engine”. Journal of Automotive Powertrain and Transportation Technology 2 (1): 47-55. https://penerbit.uthm.edu.my/ojs/index.php/japtt/article/view/11851.