**Modules to calculate the Viscosity Index or the oil viscosity at 100°C or 40°C**

- When we know the viscosity of an oil at 40°C and 100°C we can calculate its viscosity index.
- When we know the ISO Viscosity Grade at 40℃ and the viscosity index, we can calculate the viscosity at 100℃.
- When we know the ISO Viscosity Grade at 100℃ and the viscosity index, we can calculate the viscosity at 40℃.

**In the first module**

Insert:

- The viscosity at 100℃
- The viscosity at 40℃

**Calculate"**

To find the Viscosity Index

**In the second module**

Insert:

- The viscosity index
- The viscosity at 40℃

**Calculate**"

To find the viscosity at

**100℃**

**In the third module**

Insert:

- The viscosity index
- The viscosity at 100℃

**Calculate**"

To find the viscosity at

**40℃**