Base oil group 1 & group 2 viscosity index rang from 80 to 120 within 132 to 150 temperature.
Group 3 viscosity index is higher that 120 that are hydro-cracked within high pressure & heat.
| Group 1 | VI: 80-120 | Temp: 132-150 |
| Group 2 | VI: 80-120 | Temp: 132-150 |
| Group 3 | >120 | Higher pressures and temperatures |
No comment