1. **West Texas Intermediate (WTI) Crude Oil**
- Grade: Light, sweet crude with low sulfur content
2. **Brent Crude Oil**
- Grade: Light, sweet crude from the North Sea
3. **Dubai Crude Oil**
- Grade: Medium sour crude from the Middle East supply chains.
4. **OPEC Basket Crude Oil**
- Grade: Blend of various OPEC member crudes
5. **Canadian Heavy Crude Oil**
- Grade: Dense, bitumen-rich crude from Western Canada