What is the difference between Group IV and Group III oils?
1 Answers
Group IV and Group III oils differ in base oil composition, resistance to degradation, and oil film performance. Difference in base oil composition: Group IV base oils are synthetically produced and outperform Group III full synthetic base oils in overall capabilities. Difference in resistance to degradation: Group IV oils typically enter the degradation phase only after 10,000 kilometers, and the degradation is not very noticeable. In contrast, Group III full synthetic oils begin to degrade at 4,000-5,000 kilometers. Difference in oil film performance: Group IV full synthetic oils have extremely stable oil film performance, maintaining good shear resistance with long molecular chain structures that are difficult to break. Group III full synthetic oils, however, show relatively inferior stability in oil film performance.