| No. | Additive Type | Purpose |
| 1. | Pour Point Depressant | Enable lubricant to flow at low temperature |
| 2. | Viscosity Modifier | Reduce the rate of viscosity change with temperature |
| 3. | Antifoamant | Prevent lubricant from forming a persistent foam |
| 4. | Antioxidant | Retard oxidative decomposition |
| 5. | Antiwear and EP Agent | Reduce friction and wear and prevent scoring and seizure |
| 6. | Corrision and Rust Inhibitor | Prevent corrosion and rusting of metal parts in contact with the lubricant |
| 7. | Detergent | Keep surfaces free of deposits |
| 8. | Dispersant | Keep insoluble contaiminants dispersed in the lubricant |
| 9. | Friction Modifier | Alter coefficient of friction |
