What Type Of Fuel Is Used For The String Trimmer?

Have a good day!

Figuring out the right fuel for your string trimmer can often feel like a daunting task. Believe me, I’ve been there too; confused by all the technical jargon and specifications. But it’s not as complex as it may seem.

With some meticulous research and attention to detail, I’ve unpacked everything you need to know about choosing the correct fuel for your string trimmer. This blog will guide you through different types of fuels used in both 2-cycle and 4-cycle engines, teach you about the ideal fuel mix ratio, and equip you with tips on proper purchase and storage of your trimmer’s fuel.

Intrigued? Let’s dive into this less traveled terrain together!

What Type Of Fuel Is Used For The String Trimmer?

The fuel used for the string trimmer is gasoline with a minimum octane rating of 89 and a maximum ethanol content of 10%.

Gasoline with a minimum octane rating of 89

You need to use gasoline with an octane rating of 89 in your string trimmer. This kind of gas is often called midgrade. It’s better than regular gas and not as high as premium. If you use gas with an octane rating lower than 89, it may hurt the engine.

Most times, ethanol gets added to gasoline to make its octane rating go up.

Maximum ethanol content of 10%

Gasoline with an ethanol content of up to 10% is the best for string trimmers. This type of fuel blend, called E10, works well in any common string trimmer. The U.S. Environmental Protection Agency (EPA) gives a green light to it.

We need to be careful about using gas with more than 10% ethanol though! Too much ethanol can harm how your trimmer runs. Some places sell gas with up to 15% MTBE and that’s okay too, but keep a check on that ethanol level!

Read more: Rotary Scissors vs String Trimmer – Cutting Technique Revealed

What is the fuel mix for string trimmer?

High-quality oil for 2-cycle engines

I always use high-quality oil for my 2-cycle string trimmer. It’s a key part of the mix needed for these engines to work right. The blend is gas and oil, combusted together. This process keeps everything smooth inside the engine.

But not just any type of oil will do here! I never use regular lawnmower oil in my weed whacker. Instead, I stick with something marked TC-W3, meant just for 2-stroke engines like this one.

Quality matters in an engine’s life and its clean running needs this special kind of care.

Unleaded gas with low ethanol content for 4-cycle engines

I use unleaded gas with low ethanol content for my 4-cycle engine in the string trimmer. It’s important to choose fuel that contains no more than 10% ethanol because higher amounts can damage the engine.

With a 4-cycle engine, there is no need to mix oil with the gasoline like you do for a 2-cycle engine. The gas and oil stay separate, so I only need to fill up with the right fuel and I’m good to go! Some fuel stations sell gasoline specifically designed for small engines with low ethanol content, which makes it easier to find the right fuel.

Fuel Mix Ratio for String Trimmers

When it comes to fuel mix ratios for string trimmers, it’s important to follow the manufacturer’s recommendations to ensure optimal performance and longevity of your equipment.

Read more: What Grease For String Trimmer?

50:1 gasoline to oil mix for 2-cycle engines

For my string trimmer, I always make sure to use a 50:1 mix of gasoline and oil. This means that for every 50 parts of gasoline, I add one part of 2-stroke oil. Mixing them at the right ratio is super important because it helps my trimmer run smoothly and last longer.

Different manufacturers may have their own recommended ratios, so it’s essential to follow the guidelines specific to your trimmer. You can usually find the recommended mix ratio on the fuel cap or in the manufacturer’s instructions.

Keeping up with this proper fuel mix will help keep your string trimmer in good shape for all your lawn work needs.

Specific oil-to-fuel ratios recommended by manufacturers

Manufacturers provide specific oil-to-fuel ratios for string trimmers. These ratios can vary depending on the brand and model of your trimmer. You can find the recommended ratio in the manufacturer’s instructions or on the product label.

For example, some manufacturers may recommend a 32:1 or 50:1 ratio. It’s important to follow these recommendations to ensure proper engine performance and avoid damage to your trimmer.

If you’re unsure about the correct ratio for your trimmer, it’s best to consult the manufacturer’s instructions or contact their customer support for assistance.

Tips for Choosing and Using Fuel for String Trimmers

Choose fuel from reputable sources, store it properly to prevent degradation, and always follow the manufacturer’s instructions for fuel type and mix ratios. Read on to learn more about how to keep your string trimmer running smoothly.

Tips for Choosing and Using Fuel for String Trimmers

Purchase fuel from reputable sources

I always recommend purchasing fuel for your string trimmer from reputable sources. Here’s why:

  • Reputable sources ensure the quality and reliability of the fuel you use for your trimmer.
  • Tips for choosing and using fuel often emphasize the importance of buying from reputable sources.
  • When you purchase fuel from reputable sources, you can be confident that it meets the manufacturer’s requirements.
  • Reputable sources are more likely to provide ethanol-free gas, which is the best choice for two-stroke trimmers.
  • Buying fuel from reputable sources ensures that you are getting the correct fuel-to-oil ratio for your trimmer.
  • It’s important to remember that using high – quality fuel from reputable sources will not damage your trimmer.

Properly store fuel to prevent degradation

To keep my string trimmer fuel fresh and prevent degradation, I follow these steps:

  • Store fuel in a sealed container to prevent moisture from entering.
  • Keep the fuel in a cool and dry place, away from direct sunlight or extreme temperatures.
  • Use a fuel stabilizer to prolong the shelf life of the fuel and prevent it from breaking down.
  • Avoid storing fuel for long periods; it’s best to use it within 30 days.
  • Ensure that the fuel container is tightly closed to prevent evaporation and contamination.
  • Do not store fuel near open flames, sparks, or heat sources as it can be highly flammable.

Follow manufacturer’s instructions for fuel type and mix ratios

It is important to follow the instructions provided by the manufacturer for the type of fuel and mix ratios to ensure proper operation of your string trimmer. Here are some tips to help you:

  • Refer to the user guide or manual for specific fuel recommendations.
  • Use the recommended type of gasoline with a minimum octane rating of 89.
  • Check for the maximum ethanol content allowed, usually up to 10%.
  • Use high-quality oil specifically designed for 2-cycle engines if required.
  • For 4 – cycle engines, use unleaded gasoline with low ethanol content as specified by the manufacturer.
  • Make sure to mix the fuel and oil in the correct ratio. Most string trimmers require a 50: 1 gasoline-to-oil mix for 2-cycle engines.
  • If using a different brand of oil, consult the user manual or contact the manufacturer for their recommended oil-to-fuel ratios.


In conclusion, the type of fuel used for a string trimmer depends on whether it has a 2-cycle or 4-cycle engine. For 2-cycle engines, gasoline with a minimum octane rating of 89 and high-quality oil is needed in a specific mix ratio.

On the other hand, 4-cycle engines require unleaded gas with low ethanol content. It’s important to follow the manufacturer’s instructions and choose fuel from reputable sources to ensure optimal performance and longevity of your trimmer.


1. What is the fuel mix for String Trimmer?

Most string trimmers use a mixture of gasoline and oil known as two-stroke fuel. You can find pre-mixed fuel at your local hardware store or mix it yourself according to the manufacturer’s instructions.

2. Can I use regular gasoline instead of two-stroke fuel in my string trimmer?

No, you should not use regular gasoline in your string trimmer as it does not have the required lubrication properties. Using regular gasoline can cause damage to the engine and affect its performance.

3. How do I properly mix two-stroke fuel for my string trimmer?

To mix two-stroke fuel, you need to combine a specific ratio of gasoline and oil. The usual ratio is 50 parts gas to 1 part oil, but it’s best to refer to your trimmer’s manual for the correct ratio.

4. Are there any alternative fuels that can be used for a string trimmer?

Some manufacturers offer battery-powered electric string trimmers that do not require traditional fuel. These models are powered by rechargeable batteries and provide a quieter and more environmentally friendly option compared to gas-powered trimmers.

2.7/5 - (3 votes)