How to identify a 2-Cycle engine and determine the best oil to gas ratio
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The easiest way to determine if your small engine is a 2-cycle or 4-cycle is the number and type of fill ports (where you add either oil or gas) on the engine.
- If the engine has a single fill port for both the engine oil and gas, you have a 2-cycle engine.
- If the engine has two fill ports, one for gas and another separate one for oil, you have a 4-cycle engine. Do NOT mix oil and gas in these engines.
Since all 2-cycle small engines use the same fill port for both fuel and oil, a 2-cycle oil mix is necessary for your outdoor power equipment to function properly. The Specific oil/gas ratio your small engine requires can be obtained in your Operator’s Manual. Once you identify your oil/gas ratio, the following chart may be helpful:
50:1 Ratio
Gasoline |
1 Gallon |
2 Gallons |
3 Gallons |
4 Gallons |
5 Gallons |
2-Cycle Oil |
2.6 US Oz. |
5.1 US Oz. |
7.7 US Oz. |
10.2 US Oz. |
12.8 US Oz. |
32:1 Ratio
Gasoline |
1 Gallon |
2 Gallons |
3 Gallons |
4 Gallons |
5 Gallons |
2-Cycle Oil |
4.0 US Oz. |
8.0 US Oz. |
12.0 US Oz. |
16.0 US Oz. |
20.0 US Oz. |
Still need help? Contact a Briggs & Stratton dealer for assistance.
