Hamidon, Muhammad Luqman Haikal, Rozita Jumadi, Amir Khalid, Norrizam Jaat, Hamidon Salleh, and Syahrullail Samion. 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.