What Does 25:1 Mean
The ratio 25: 1 is used to describe how fuel and oil should be mixed for a 2-stroke engine. It means you need:
- 25 parts of gasoline
- 1 part of 2-stroke oil
So, for every 25 units of fuel, you add 1 unit of oil to properly lubricate the engine.
Note: You Should use 2 stroke mil mixing calculator for accurate result.
Examples
- 1 litre of fuel → add 40 ml of 2-stroke oil
- 1 US gallon of fuel → add 5 fl oz of 2-stroke oil
Metric (Liters : Milliliters Oil)
| Fuel (L) | Oil (mL) |
|---|---|
| 1 L | 40 mL |
| 2 L | 80 mL |
| 3 L | 120 mL |
| 4 L | 160 mL |
| 5 L | 200 mL |
| 7.5 L | 300 mL |
| 10 L | 400 mL |
| 15 L | 600 mL |
| 20 L | 800 mL |
| 25 L | 1000 mL |
US (Gallons : Fluid Ounces Oil)
| Fuel (gal) | Oil (fl oz) |
|---|---|
| 1 gal | 5 fl oz |
| 1.5 gal | 8 fl oz |
| 2 gal | 10 fl oz |
| 2.5 gal | 13 fl oz |
| 3 gal | 15 fl oz |
| 4 gal | 20 fl oz |
| 5 gal | 26 fl oz |
| 7.5 gal | 38 fl oz |
| 10 gal | 51 fl oz |
| 15 gal | 77 fl oz |
Why the Ratio Matters
Two-stroke engines don’t have a separate oil system, so the oil must be mixed directly with the fuel. Getting the ratio correct helps the engine run smoothly, avoid damage, and reduces smoke.