CST 4
Group III base oils are greater than 90 percent saturates, less than 0.03 percent sulfur and have a viscosity index above 120. These oils are refined even more than Group II base oils and generally are severely hydrocracked (higher pressure and heat). This longer process is designed to achieve a purer base oil.
| Characteristics | ASTM Method | Results |
|---|---|---|
| Appearance | - | Clear & Bright |
| Color | D-1500 | L 0.5 |
| Density at 15 °C, kg/ltr | D-1298 | 0.835 |
| Kinematic Viscosity at 40 °C, Cst | D-445 | Min 19.4 |
| kinematic viscosity at 100 °C, Cst | D-445 | Min 4.2 |
| Viscosity Index | D-2270 | Min 120 |
| Pour Point , °C | D-97 | Max -12 |
| Flash Point ,°C | D-92 | Min 220 |