How to mix chainsaw gas

Gas being poured into chainsaw
(Image credit: Getty Images)

Want to take the graft out of the toughest DIY jobs? Whether you’re chopping firewood or felling a tree, a chainsaw is essential. To get the most out of your device, you’ll need to maintain it correctly. Here, you’ll learn how to mix chainsaw gas properly to keep your device in top condition.

Whether you’re a newbie or a pro, you’ll need to mix chainsaw gas at regular intervals, so it’s worth honing your skills. If you get the ratios wrong, you may experience issues ranging from poor performance to overheating, which can lead to costly repairs.

We’ve consulted an expert about how to mix chainsaw gas for the best results. You’ll learn how to achieve the perfect balance of gas to oil. 

Looking for a chainsaw that’s a cut above the competition? Our round-up of the best chainsaws includes top-rated gas and electric models.

For now, let’s take a closer look at how to mix chainsaw gas.

How to mix chainsaw gas

Rick Jason Martineau
Rick Jason Martineau

Rick Jason Martineau has over five years of experience at Husqvarna Group and is currently the Senior Training Specialist for Tree Professional Products, Safety, and Advocacy for North America. He has had the privilege of being involved in the forest industry for over 40 years.

Want to learn how to mix chainsaw gas? Here’s our step-by-step guide.

1. Select gas and oil

First, pick the correct fuel. For best results, opt for a high-quality fuel with low ethanol content. While it may be tempting to settle for the cheapest option, it can damage your chainsaw in the long run. “Use non-ethanol fuel or if that’s not available, use the highest octane at the pump, usually 92 or 93,” says Rick Jason Martineau, Senior Training Specialist for Tree Professional Products at Husqvarna

It’s crucial to use 2-stroke oil for your chainsaw. Never use 4-stroke motor oil, as it can damage the engine.

2. Find a suitable container

Use a clean container to mix your fuel to avoid contamination. “Never mix the fuel in the tank, as it won’t be accurate and could cause permanent damage,” cautions Rick.

3. Mix the fuel and gas

Check your manual for guidance on proportions. In most cases, the golden ratio of fuel to oil is 50:1. “Use a fuel amount that you will use completely in less than 30 days, preferably one gallon at a time,” advises Rick. This is because fuel has a limited shelf life.

Pour half of the total gas into your container. Add the oil and shake. Next, incorporate the remaining gas. 

4. Re-fuel your chainsaw

Wipe the area around the fuel cap to prevent debris from falling inside. Open the fuel cap gently as pressure may have accumulated. Carefully pour the fuel into your chainsaw. 

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Louise Bond

Louise Bond is a UK-based writer specializing in health and wellbeing. She has over eight years of experience in management within health and care and brings this passion and expertise to her writing. Louise has been published in The Guardian, Live Science, Fit & Well, Tom’s Guide, Planet Mindful, Breathe, and Psychreg. She is at her happiest when she is out in nature, whether that’s on an invigorating hike or pottering in the garden.

With contributions from