How to Mix Chainsaw Gas in 4 Simple Steps: Do’s and Don’ts

If you’re a chainsaw user, then you know that using the right gas-oil mixture can make the difference between a healthy and efficient chainsaw and one that’s constantly breaking down.

But how to mix chainsaw gas without making a mess and damaging your engine?

The good news is that it’s not as complicated as it seems, and this article will show you how to mix chainsaw gas in four simple and easy steps.

Things To Do Before Mixing a chainsaw Gas

Move to an open, well-ventilated space away from children.

Make sure no one is smoking nearby.

Check that your firewood chainsaw is turned off and has Read on to find out more!

Types of Gas for Chainsaws

Avoid using low-octane gasoline. Gasoline with a rating of 89 or higher with no ethanol is better for a chainsaw.

It provides high power and performance, allowing the chainsaw to work more efficiently.

Now that you have the right type of gas, it’s time to learn how to mix chainsaw gas. Follow these four simple and easy steps, and you’ll be ready to go in no time.

Steps To Mix Chainsaw Gas

Step 1: Gather the Materials Needed for Mixing Chainsaw Gas 

You will need:

  • a gas can
  • a measuring cup
  • High Octane Gasoline
  • chainsaw bar oil

Step 2: Measure Out the Right Amount of Fuel and Oil 

The fuel-to-oil ratio for a chainsaw is 50:1, which means you will need

  • 2.6 ounces of oil for every gallon of fuel
  • 5.2 ounces of oil for 2 gallons of fuel
  • 7.8 ounces of oil for 3 gallons of fuel
  • 10.4 ounces of oil for 4 gallons of fuel

To determine the amount of oil you need for your chainsaw, use a measuring cup to measure out 2.6 ounces of bar oil. When measuring the oil, make sure to fill the measuring cup completely and level off any excess.

Step 3: Mix the Fuel and Oil 

Once you have the right amount of fuel and oil, slowly pour the oil into the gas can.

Once you have the correct mix of gasoline and oil, it’s important to shake the container until everything is evenly mixed.

This makes sure that the fuel and oil are spread out evenly in the gas tank of the chainsaw. 

Step 4: Fill Up Your Chainsaw with the Mixture

Once the fuel and oil are fully mixed, you can fill up your chainsaw with the mixture. Make sure to use a funnel to avoid spilling any of the mixtures.


Clean the Fuel Cap

Always make sure to clean the fuel cap before pouring the fuel into the tank. This will help keep any dirt or debris from getting into the fuel mixture and clogging up the filters on your chainsaw. 

Also, to prevent the risk of fuel coming into direct contact with your skin and eyes, make sure to open the fuel cap carefully in order to release the pressure slowly.

Correct Mixture of Fuel and Gas

Thirdly, properly mixing chainsaw gas is essential for the safe and efficient operation of your chainsaw. The incorrect mix of fuel and oil can damage your saws’ pistons in the long run.

Never mix gasoline and oil in your chainsaw

Avoid mixing the oil and gas directly in the fuel tank. Instead, mix them in a separate, approved container, and then pour the mixture into the tank.

Use Premium Oil

Using premium fuel is essential to making sure your chainsaw runs efficiently. Low-grade fuel with a lower octane rating than 89 might save you money in the short term, but it could cause major problems with your chainsaw’s engine in the long run.

Using the right container

Chainsaw gas should never be mixed in an open container. It’s important to use a container that is approved for gasoline and that is marked with the gasoline capacity. 

Use Approved Container

Do not use a container that is not approved by Underwriters Laboratories (UL) or Factory Mutual (FM)

Type of Gas for Chainsaw

Never get cheap gas. uses less cheap and less efficient fuel. Ethanol-free fuel needs an 87-octane rating. It reduces engine temperature, so the components are less exposed to the elements.

Steve’s Small Engine Saloon

How to Mix Chainsaw Gas FAQs

Does 40 to 1 have more oil than 50 to 1?

The difference between a 40:1 and 50:1 ratio is the amount of oil.

A 40:1 mix contains four parts gasoline and one part oil, while a 50:1 mix contains five parts gasoline and one part oil.

When mixing chainsaw gas with oil, it is important to use a recommended 2-stroke oil, such as one from Stihl or Husqvarna.

What is the correct fuel mixture for chainsaws?

Most chainsaw manufacturers recommend a 50:1 fuel-to-oil ratio. This means that you should mix 2.6 ounces of two-stroke oil with 1 gallon of gasoline.

Some older models also recommend 20:1 or 30:1. Keep in mind that it depends on the oil being used.

Nowadays, most oil on the market requires a 40:1 or 50:1 fuel-to-oil ratio.

Do chainsaws take regular or mixed gas?

Chainsaws are typically powered by a combination of gasoline and oil. The exact fuel-to-oil ratio will vary depending on the make and model of the chainsaw, but it is usually 50:1 (2.6 ounces of two-stroke oil to 1 gallon of gasoline).

How much 2-cycle oil do you put in a gallon of gas for a chainsaw?

Most chainsaws require a 50:1 fuel-to-oil ratio, which means you should mix 2.6 ounces of two-stroke oil with 1 gallon of gasoline.

Some older models may require a different ratio, such as 20:1 or 30:1. However, it depends on the oil being used in the chainsaw.

How to mix Stihl chainsaw gas?

Stihl recommends a 50:1 fuel-to-oil ratio, which means you should mix 20 ml of two-stroke oil with 1 liter of regular unleaded gasoline.

For larger amounts, you can mix 2.6 ounces of two-stroke oil with 1 gallon (3.785 liters) of gasoline.

It is important to always use fresh fuel and two-stroke oil that is specifically designed for chainsaws.

Wrap Up

Mixing chainsaw gas correctly is essential for the safe and efficient operation of your chainsaw.

Invest in premium fuel and the recommended 2-stroke oil to ensure your chainsaw runs smoothly for years.

Don’t take any risks—avoid mixing gasoline and oil directly in the tank; instead, use an approved container to mix them together beforehand.

Plus, make sure you always adhere to your chainsaw’s instructions so that the balance of gas and oil is perfect every time!

If you follow all of these steps, your sawing partner will live a long and happy life.

Photo of author

Charlie Bass

Charlie has been a mechanic for over 25 years and has worked on everything from small engine gardening equipment to huge diesel-electric mining haul trucks, trains and even aircraft. This broad range of industry experience gives him a unique insight into almost anything mechanical especially with an engine, including gardening and landscaping equipment. He currently owns his own mobile mechanic business and lives with his family in Australia.

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