Department of Food Science and Technology, School of Food Science and Pharmaceutical Engineering, Nanjing Normal University, 2 Xuelin Road, Nanjing, Jiangsu 210023, People’s Republic of China ...

Under the microscope here is 0W-20 synthetic oil, a particularly fine oil. One of the main benefits of 0W-20 oil is that it's very thin, which allows it to flow around the engine's internals easily.