30:1 Mix Ratio Calculator & Chart
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30:1 Mix Calculator
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What is a 30:1 Mix Ratio?
A 30:1 mix ratio means you mix 30 parts gasoline with 1 part 2-stroke oil. This creates a fuel mixture that is 3.33% oil and 96.67% gasoline by volume.
The 30:1 ratio is commonly used for vintage outboard motors and older 2-stroke equipment from the 1970s and earlier.
The 30:1 ratio equals approximately 4.27 fl oz (126 mL) of oil per gallon of gasoline, or about 33.3 mL per liter.
Complete 30:1 Mixing Chart
Use this chart for quick reference when mixing fuel at 30:1 ratio:
US Gallons
| Fuel (Gallons) | Oil (fl oz) | Oil (mL) | Oil (Liters) |
|---|---|---|---|
| 1 gallon | 4.3 fl oz | 126 mL | 0.126 L |
| 2 gallons | 8.5 fl oz | 252 mL | 0.252 L |
| 2.5 gallons | 10.6 fl oz | 315 mL | 0.315 L |
| 3 gallons | 12.8 fl oz | 378 mL | 0.378 L |
| 4 gallons | 17.0 fl oz | 504 mL | 0.504 L |
| 5 gallons | 21.3 fl oz | 630 mL | 0.630 L |
| 6 gallons | 25.5 fl oz | 756 mL | 0.756 L |
| 10 gallons | 42.6 fl oz | 1262 mL | 1.262 L |
Liters
| Fuel (Liters) | Oil (mL) | Oil (fl oz) |
|---|---|---|
| 1 liter | 33 mL | 1.13 fl oz |
| 2 liters | 67 mL | 2.25 fl oz |
| 5 liters | 167 mL | 5.64 fl oz |
| 10 liters | 333 mL | 11.27 fl oz |
| 20 liters | 667 mL | 22.54 fl oz |
Equipment That Uses 30:1 Ratio
The 30:1 ratio is commonly used for vintage outboard motors and older 2-stroke equipment:
Vintage Outboard Motors
Classic outboard motors from the 1970s and earlier often require 30:1 mix ratio.
Older 2-Stroke Equipment
Professional and commercial equipment manufactured before modern oil formulations.
Classic Motorcycles
Vintage 2-stroke motorcycles and scooters from the pre-1980s era.
Break-in Period
Some manufacturers recommend richer oil mixture during engine break-in.
Always Use Your Equipment's Recommended Ratio
Using the wrong ratio can damage your engine. Check your owner's manual for the correct ratio.
- 50:1 = 2.6 oz/gallon (most modern equipment)
- 40:1 = 3.2 oz/gallon (some older equipment)
- 32:1 = 4.0 oz/gallon (high-performance, older equipment)
- 30:1 = 4.3 oz/gallon (vintage outboard motors)
- 25:1 = 5.1 oz/gallon (very old equipment)
30:1 Ratio FAQs
- Pour desired amount of gasoline into an approved fuel container
- Measure 4.27 fl oz of 2-stroke oil per gallon (use chart above)
- Add oil to gasoline (not the other way around)
- Cap the container and shake for 30 seconds to mix thoroughly
- Use within 30 days for best results