Stihl Chainsaw Gas Mix (The 360 Guidelines)

Proper fuel mixing is the key to keeping your chainsaw engine young and running smoothly for the years to come. Luckily, the equation and the procedure are not complicated at all. 

All machines from Stihl that run on gasoline follow a simple ratio of 50:1 of gas and oil, respectively. The oil also needs to be 2-cycle engine oil for Stihl chainsaws. 

If you want more details on the Stihl chainsaw gas mix, make sure to read the whole article. 

Stihl Oil Mix Ratio Chart

Let’s take a look at the table below to learn the proportion between gas and oil for your Stihl chainsaw:

Gasoline (Gallon) Oil (Fluid Ounces)
1 2.6
2.5 6.4
5 12.8

The Table below is for users searching for the ratio in the metric system:

1 Litre 1 Litre 20 ml
2 Litre 2 Litre 40 ml
3 Litre 3 Litre 60 ml
5 Litre 5 Litre 100 ml
10 Litre 10 Litre 200 ml
20 Litre 20 Litre 400 ml

Stihl Chainsaw Gas Mix: How-To

Now that you know the measurements for mixing oil and gas for your chainsaw, it’s time to get to the actual procedure of doing it. Before jumping to the step-by-step procedure of mixing the fuel, let’s see the things you will need. 

Things You Will Need

  • A Gallon Container
  • 2.6 Fluid Ounce Synthetic 2-Cycle Oil
  • 1 Gallon 89+ Octane Gas
  • Gloves

Step 1: Wear Gloves

I can’t emphasize enough how important it is to use gloves during the procedure. If you want to ensure safety, no part of the fuel should touch your skin. So, make sure to have a pair of gloves nearby whenever you’re mixing fuel for your chainsaw. 

Step 2: Pour Oil to the Container

Measure the oil and make sure it’s 2.6 fluid ounces. You must use a 2-cycle synthetic oil for your Stihl chainsaw. That’s the most suitable option to keep your engine more effective and increase its longevity. 

Step 3: Add Gas

Now, add 1 gallon of gas to the container. You want to make sure that you’re using the best available gas. So, look for 89+ octane gas.

It may cost you a few extra bucks, but it will certainly be worth it. Cheap gas may cause your engine to run hot and do more damage than good.  

Step 4: Shake Well

After adding the oil and the gas to the container, it’s time to mix them well. Make sure that the container cap is tightly secure so that the mixture inside doesn’t leak. Give it a good shake, and the fuel mixture is ready to use. 

Stihl Chainsaws Fuel Mixture: Dos And Don’ts

You can never be too careful when dealing with fuel. Make sure to keep the following things in mind before going through the procedure. 

Shake Before Each Use

When you’re loading your chainsaw with a previously mixed fuel, you have to shake the mixture each time. After sitting for a while, the gas and oil can get separated. So, make sure that you’re giving the mixture a good shake before using it every time. 

Do Not Store the Mixture for Long

It’s recommended not to store the oil and gas mixture for too long. The best measurement is to mix the fuel for a few uses. You can store the mixture without compromising its integrity for about a month. However, the duration should never exceed three months. 

Use Proper Products

Using the correct products can make your chainsaw more effective and safe to use. This includes investing in a good container, suitable oil, and gas. Let’s take a look at the best options available for you:

Product Type Product Features
Oil STIHL  2.6 Ounce 2-Cycle Engine Oil Compatible with all Stihl chainsaws.


Highly synthetic.

Fuel Container No-Spill 5-Gallon Poly Gas Can Push button control.

Extra handle. 

Fast flow rate.

Premixed Fuel

If you want to skip the mixing procedure entirely, there’s a simple solution to that. The brand offers a patented premixed fuel that you can use for your chainsaw. The fuel is called Stihl Motomix, and you can find it on the brand’s website.

This fuel is mixed using the standard ratio suitable for all gasoline-powered machines from Stihl, especially for chainsaws. 

Where to Find the Stihl Chainsaw Gas Oil Ratio

The brand always suggests that you take a look at the manual before mixing the fuel for your chainsaw. Even though the ratio is identical for all Stihl chainsaws, the manual can offer a better insight into understanding the particular model. 

Even if you don’t have the manual anymore, you can still get access to the digital version without paying anything. Stihl’s website has manuals for all machines manufactured by the brand. 

In case you need to replace your chainsaw parts, you can check my article on the Stihl chainsaw parts diagram.

Safety Measures

  • Use a proper container to make it easy for you to mix the fuel. 
  • Keep the mixture store in a safe place. 
  • Always use gloves when mixing and pouring fuel. 
  • Make sure to keep all types of sources that can cause a fire away from the fuel

Frequently Asked Questions

What is a 50 to 1 mix in liters?

If you are measuring the fuel mixture in liters, the ratio will be 5 liters to 0.10 liters for gas and oil, respectively. 

How to choose gasoline for a chainsaw?

The best option for gasoline is the one that has at least an 89-octane rating. If you are selecting something lower than that, the gasoline may heat up your engine and damage it in the long run. 

How long can I store mixed fuel for the chainsaw?

It’s best to use the mixed fuel for up to 30 days. Make sure not to use a fuel mixture that’s more than three months old.

Wrap Up

The equation and method of the Stihl chainsaw gas mix are like any other tool from the brand. It’s an easy-to-understand ratio and a straightforward process to do.

In addition, there’s an option of premixed fuel for those who want to skip the entire process altogether.   

Regardless of which option you go for, it’s important to use the right products. Where your chainsaw is concerned, you can never be too careful with its maintenance and care.

Jim Boslice

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