Approximate mapping between ISO VG grade numbers (viscosity at 40 °C) and SAE J300 engine-oil / gear-oil grades.
Formula
$$ \text{ISO VG} \leftrightarrow \text{SAE} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $ISO VG$ | ISO viscosity grade | cSt at 40 °C | ISO 3448 |
| $SAE$ | SAE J300 grade number | - | SAE J300 |
Sources
- ISO 3448 - Viscosity classification.
- SAE J300 - Engine oil viscosity.