| CRUDE OIL CLASS | PROPERTY RANGE | |
| GRAVITY /API | SULFUR /Wt. % | |
| Light Sweet | 35 - 60 | 0 - 0.5 |
| Light Sour | 35 - 60 | >0.5 |
| Medium Medium Sour | 26 - 35 | 0 - 1.1 |
| Medium Sour | 26 - 35 | >1.1 |
| Heavy Sweet | 10 - 26 | 0 - 1.1 |
| Heavy Sour | 10 - 26 | >1.1 |