20:1 fuel mix: how much oil per gallon?
For a 20:1 mix, add 6.4 fl oz (189 ml) of 2-stroke oil to each US gallon of gas, or 50 ml per liter. That is 5 % oil.
A 2.6 fl oz bottle of oil goes with 52 fl oz (1.54 L) of gas at 20:1.
20:1 oil per US gallons of gas
20:1 oil per US gallons of gas| Gas | Oil | In spoons |
|---|
| 1 gal | 6.4 fl oz (189 ml) | 12.8 tbsp · 38.4 tsp |
|---|
| 2 gal | 12.8 fl oz (379 ml) | 25.6 tbsp · 76.8 tsp |
|---|
| 2.5 gal | 16 fl oz (473 ml) | 32 tbsp · 96 tsp |
|---|
| 3 gal | 19.2 fl oz (568 ml) | 38.4 tbsp · 115.2 tsp |
|---|
| 5 gal | 32 fl oz (946 ml) | 64 tbsp · 192 tsp |
|---|
20:1 oil per liters of gas
20:1 oil per liters of gas| Gas | Oil |
|---|
| 1 L | 50 ml (1.7 fl oz) |
|---|
| 4 L | 200 ml (6.8 fl oz) |
|---|
| 5 L | 250 ml (8.5 fl oz) |
|---|
| 10 L | 500 ml (16.9 fl oz) |
|---|
| 20 L | 1,000 ml (33.8 fl oz) |
|---|
Every common ratio, per gallon and per liter
Every common ratio, per gallon and per liter| Ratio | Oil per gallon | Oil per liter |
|---|
| 50:1 | 2.6 fl oz (76 ml) | 20 ml |
|---|
| 40:1 | 3.2 fl oz (95 ml) | 25 ml |
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| 32:1 | 4 fl oz (118 ml) | 31 ml |
|---|
| 25:1 | 5.1 fl oz (151 ml) | 40 ml |
|---|
| 20:1 | 6.4 fl oz (189 ml) | 50 ml |
|---|
50:1 means 50 parts gas to 1 part oil: oil = gas ÷ 50, gas = oil × 50. 1 US gal = 128 fl oz = 3.785 L; 1 imperial gal = 4.546 L. Spoons are US: 1 tbsp = 1/2 fl oz, 1 tsp = 1/6 fl oz.
Estimates. Follow your engine manual’s ratio and the oil maker’s label. Mix outdoors in an approved fuel can, away from sparks and flames.
Frequently asked questions
How much oil per gallon at 20:1?
For a 20:1 mix, add 6.4 fl oz (189 ml) of 2-stroke oil to each US gallon of gas, or 50 ml per liter. That is 5 % oil.
How much oil for 5 gallons at 20:1?
32 fl oz (946 ml): 5 × 128 = 640 fl oz of gas, and 640 ÷ 20 = 32.
What percent oil is 20:1?
5 %: 1 part oil to 20 parts gas, and 1 ÷ 20 = 0.05. Use the ratio your engine’s manual gives.