2-Stroke Oil Mixing Chart
This is the complete reference for all 2-stroke fuel ratios. Use this chart to find the exact oil amount you need for any fuel quantity.
Complete Ratio Chart
| Ratio | Oil per Gallon (US) | Oil per Liter | Common Use |
|---|---|---|---|
| 50:1 → | 2.56 fl oz | 20 mL | Modern chainsaws, trimmers, newer outboards |
| 40:1 → | 3.2 fl oz | 25 mL | Older equipment, heavy-duty chainsaws, boats |
| 32:1 → | 4 fl oz | 31.25 mL | High-load equipment, older outboards |
| 30:1 | 4.27 fl oz | 33.3 mL | Some vintage outboard motors |
| 25:1 → | 5.1 fl oz | 40 mL | Performance engines, ATVs |
| 20:1 → | 6.4 fl oz | 50 mL | High-performance, racing |
| 16:1 → | 8 fl oz | 62.5 mL | Heavy-duty racing |
How to Use This Chart
Find your fuel ratio in the left column, then look across to find the oil amount that matches your fuel quantity:
- For 1 gallon of fuel, use the "Oil per Gallon" column.
- For 1 liter of fuel, use the "Oil per Liter" column.
- For other amounts, multiply by the ratio. For example: 2 gallons at 50:1 = 2 × 2.56 = 5.12 fl oz of oil.
Pro Tips
- Always check your equipment manual for the recommended ratio before mixing.
- Use quality 2-stroke oil specifically designed for your engine type.
- Measure accurately with a calibrated cup, syringe, or graduated cylinder.
- Mix thoroughly by shaking the container for 30-60 seconds.
- Use fresh fuel within 30 days for best engine performance.
- When in doubt, use a richer mixture (more oil) rather than a leaner one.
Outboard Motor Oil Ratio Chart
Outboard motors typically require specific ratios depending on age and manufacturer. This outboard-specific chart helps you mix the correct fuel for marine engines:
| Motor Type | Typical Ratio | Oil per Gallon | Oil per Liter |
|---|---|---|---|
| Modern 2-stroke outboards (post-2000) | 50:1 | 2.56 fl oz | 20 mL |
| Older outboards (1990s) | 40:1 or 50:1 | 2.56-3.2 fl oz | 20-25 mL |
| Vintage outboards (1970s-1980s) | 30:1 or 32:1 | 4-4.27 fl oz | 31-33 mL |
| Classic/antique outboards (pre-1970) | 20:1 or 25:1 | 5.1-6.4 fl oz | 40-50 mL |
Important: Always check your outboard's manual or decal for the manufacturer-recommended ratio. Brands like Mercury, Johnson, Evinrude, Yamaha, and Suzuki may have specific requirements. Use TCW-3 certified marine oil for best results.
Quick Reference: Common Fuel Volumes
Need to mix 2, 5, or 6 gallons? Here are the most commonly mixed volumes:
| Fuel Volume | 50:1 Oil | 40:1 Oil | 32:1 Oil |
|---|---|---|---|
| 2 gallons | 5.12 fl oz | 6.4 fl oz | 8 fl oz |
| 5 gallons | 12.8 fl oz | 16 fl oz (1 pint) | 20 fl oz |
| 6 gallons | 15.36 fl oz | 19.2 fl oz | 24 fl oz (1.5 pints) |
| 10 gallons | 25.6 fl oz | 32 fl oz (1 quart) | 40 fl oz |