Is this a 2-cycle engine? If so, what is the best oil gas ratio?



Briggs and Stratton no longer manufactures 2-cycle engines. Two-cycle engines are able to propel your lawn mower, snow blower or pressure washer in one crankshaft revolution and two strokes of the piston.

In this FAQ, you’ll learn:

How to Identify a 2-Cycle Small Engine
How To Determine the 2-Cycle Engine Oil Mix

How to Identify a 2-Cycle Small Engine

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. Compare your gas cap and/or oil port with the images below.

  • If the engine has a single fill port for both the engine oil and gas, you have a 2-cycle engine.
2 Cycle Engine Fill Port by Briggs & Stratton
  • 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.
Best Oil Gas Ratio Small Engine by Briggs & Stratton
Fill Ports for Best Engine Oil to Gas Ratio by Briggs & stratton

How To Determine the 2-Cycle Engine Oil Mix

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 for your lawn mower, snow blower or power washer 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.


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