Can I Put Mixed Gas In My Lawn Mower?

Last Updated on March 26, 2024 by Sharaj

When it comes to maintaining your lawn mower’s performance and longevity, choosing the right fuel is crucial. One common question that arises is, “Can I put mixed gas in my lawn mower?”

In this comprehensive guide, we will delve into the intricacies of fueling your mower and provide expert advice to help you make the right choices.

Can I Put Mixed Gas in My Lawn Mower?

Using mixed gas, a combination of gasoline and oil, is a practice commonly associated with two-stroke engines, such as those found in many older model chainsaws and leaf blowers.

However, most modern lawn mowers use four-stroke engines, which require a different fuel mixture. Putting mixed gas in your lawn mower designed for regular gasoline can lead to engine damage, reduced performance, and increased emissions.

The Importance of Proper Fueling

Put Mixed Gas in My Lawn Mower

Using the correct type of fuel for your lawn mower is essential to ensure optimal performance and longevity. Four-stroke engines, commonly used in modern mowers, are designed to run on regular unleaded gasoline with the appropriate octane rating.

Mixing oil with the fuel can disrupt the engine’s combustion process, leading to inefficient operation and potential damage.

Understanding Two-Stroke vs. Four-Stroke Engines

To comprehend the fuel requirements of your lawn mower, it’s crucial to understand the engine type it uses. Two-stroke engines require a mixture of gasoline and oil for lubrication, as the oil is not stored in a separate reservoir.

In contrast, four-stroke engines have a dedicated oil reservoir and run on pure gasoline. Mixing oil with the fuel of a four-stroke engine can cause oil buildup in the combustion chamber, leading to carbon deposits and decreased engine performance.

FAQs About Fueling Your Lawn Mower

Can I use premium gasoline in my lawn mower?

Yes, you can use premium gasoline, but it’s not necessary. Most lawn mowers are designed to run efficiently on regular unleaded gasoline with an octane rating of 87 or higher. Premium gasoline may offer better performance in some high-compression engines, but for most mowers, regular unleaded gasoline is sufficient.

Are there any additives I should use in my mower’s fuel?

It’s generally unnecessary to use fuel additives in your lawn mower’s fuel. Modern fuels already contain detergents and stabilizers that help keep the engine clean and prevent fuel degradation. However, if you plan to store your mower for an extended period, using a fuel stabilizer can help prevent fuel-related issues.

Can I use ethanol-blended gasoline in my lawn mower?

Using ethanol-blended gasoline with up to 10% ethanol (E10) is usually safe for most lawn mowers. However, higher ethanol blends (E15 or E85) should be avoided, as they can lead to engine damage, poor performance, and increased emissions. Check your mower’s manual for specific fuel recommendations.

How should I store fuel for my lawn mower?

When storing fuel for your lawn mower, use a fuel container specifically designed for gasoline storage. Keep the container in a cool, dry place, away from direct sunlight and heat sources. Use fuel within 30 days to ensure its freshness and stability.

Can stale fuel damage my lawn mower’s engine?

Yes, stale fuel can lead to starting difficulties, poor engine performance, and increased emissions. To prevent these issues, only use fresh fuel and drain any remaining fuel from the tank before storing your mower for an extended period.

Should I run the mower’s engine dry before storage?

It’s a good practice to run the mower until the fuel tank is nearly empty before storing it for the off-season. This helps prevent stale fuel buildup in the carburetor and fuel system. However, be cautious not to run the engine completely dry, as this can lead to damage.


In conclusion, the answer to the question, “Can I put mixed gas in my lawn mower?” is a resounding no. It’s essential to use the correct type of fuel as specified in your mower’s manual to ensure optimal performance and longevity.

By following proper fueling practices and adhering to manufacturer recommendations, you can keep your lawn mower running smoothly and enjoy a well-maintained lawn.

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