The warm weather has finally arrived, and that means it’s time to break out the lawn mower and tackle those overgrown patches. But before you crank it up, there’s an important question you need to consider: what gas should you be using? The answer isn’t as simple as you might think. Using the wrong fuel can lead to engine problems, costly repairs, and even damage your mower.
This article will guide you through the different types of gasoline suitable for lawn mowers, explore their pros and cons, and help you determine the best option for your specific needs. We’ll also address common myths and misconceptions surrounding lawn mower fuel, so you can make an informed decision and ensure a smooth and trouble-free mowing season.
The Basics of Lawn Mower Fuel
Lawn mowers typically use gasoline, often referred to as “petrol” in some parts of the world. This fuel is a blend of hydrocarbons, which provide the energy to power the engine. However, not all gasoline is created equal. Different types of gasoline have varying levels of octane rating and additives, which can significantly affect your mower’s performance and longevity.
Understanding Octane Ratings
Octane rating is a measure of a fuel’s resistance to knocking or pinging. Knocking is a premature combustion that can damage your engine. Higher octane ratings generally provide better resistance to knocking, but they are not always necessary.
Here’s a breakdown of common octane ratings:
- 87 Octane (Regular): This is the most common and least expensive gasoline available. It’s suitable for most lawn mowers, especially those with older engines.
- 89 Octane (Mid-grade): This offers slightly better performance than regular gasoline and is suitable for newer mowers with higher compression engines.
- 91 Octane (Premium): This provides the highest level of knock resistance and is generally recommended for high-performance engines, such as those found in racing vehicles. However, it’s rarely necessary for standard lawn mowers.
Choosing the Right Octane:
Your lawn mower’s owner’s manual will specify the recommended octane rating. Always adhere to these guidelines to ensure optimal performance and avoid engine damage. If you’re unsure about the recommended octane, err on the side of caution and use regular gasoline (87 octane).
The Importance of Additives
In addition to octane rating, gasoline contains additives that enhance performance, improve storage stability, and protect against corrosion. These additives can be crucial for ensuring the smooth operation of your lawn mower.
1. Ethanol
Ethanol is a biofuel blended into gasoline to reduce emissions. However, it can cause problems for lawn mower engines, particularly older models. Ethanol absorbs water, which can lead to corrosion, fuel line blockage, and engine damage.
Ethanol-Free Gasoline:
For older lawn mowers or those prone to fuel-related issues, consider using ethanol-free gasoline. This type of gasoline contains no ethanol, reducing the risk of corrosion and other problems. Ethanol-free gasoline is often available at marinas and specialty fuel retailers.
2. Fuel Stabilizers
Fuel stabilizers are additives that help prevent the deterioration of gasoline over time. They slow down the oxidation process, which can lead to gum and varnish buildup in your engine.
When to Use Fuel Stabilizers:
If you plan to store your lawn mower for extended periods, it’s essential to add fuel stabilizer to your tank. This will help preserve the fuel and prevent engine problems when you start your mower next season.
Tips for Using Gasoline in Your Lawn Mower
Here are some practical tips for using gasoline in your lawn mower:
- Use fresh gasoline: Old gasoline can become stale and gum up your engine. Try to use gasoline that’s less than 30 days old.
- Don’t overfill the tank: Leaving too much space in your tank will help prevent fuel from sloshing around and potentially causing leaks.
- Store your mower properly: When storing your mower for extended periods, drain the fuel tank or add fuel stabilizer to prevent engine damage.
- Keep your mower clean: Regularly clean your mower’s fuel lines and filter to prevent clogs and ensure optimal fuel flow.
Myth Busting
Myth: You can use any type of gasoline in your lawn mower.
Truth: While most lawn mowers can run on regular gasoline, using the wrong type of fuel can lead to engine problems and reduce your mower’s lifespan. Always refer to your owner’s manual for the recommended octane rating and avoid using fuel with high ethanol content, especially for older mowers.
Conclusion
Choosing the right gas for your lawn mower is crucial for its performance and longevity. By understanding octane ratings, additives, and proper storage techniques, you can ensure a smooth and trouble-free mowing season. Remember to always consult your owner’s manual for the recommended fuel type and adhere to the guidelines for optimal performance and long-term engine health.
FAQ
What type of gas should I use in my lawn mower?
Most modern lawn mowers require unleaded gasoline with an octane rating of 87 or higher. Avoid using gasoline with a lower octane rating, as it can cause engine knocking and damage. Ethanol is a common additive to gasoline, but it can also cause problems in lawn mower engines. Look for gasoline with a low ethanol content, typically 10% or less.
What are the different types of gasoline?
Gasoline is typically classified by its octane rating. Higher octane gasoline is more resistant to knocking, which is a pre-ignition event that can damage the engine. Regular gasoline, with an octane rating of 87, is usually sufficient for most lawn mowers. Premium gasoline, with an octane rating of 91 or higher, is not necessary unless your mower’s owner’s manual specifically recommends it.
What is ethanol and why is it bad for lawn mowers?
Ethanol is a biofuel that is added to gasoline to reduce emissions and improve fuel economy. However, ethanol can cause problems in lawn mower engines, such as:
- Phase separation: Ethanol can absorb water from the air, which can separate from the gasoline and clog the fuel system.
- Corrosion: Ethanol can corrode metal parts in the engine, particularly the fuel lines and carburetor.
- Gelling: In cold weather, ethanol can gel and clog the fuel lines, preventing the engine from starting.
Is it okay to use gas with ethanol in my lawn mower?
While ethanol is not ideal for lawn mowers, you can use gasoline with a low ethanol content, typically 10% or less. However, it is best to avoid using gasoline with higher ethanol concentrations, as it can lead to the problems mentioned above.
How do I know what gas to use in my lawn mower?
The best way to determine the correct type of gasoline for your lawn mower is to consult the owner’s manual. The manual will specify the recommended octane rating and ethanol content. If you don’t have the manual, you can usually find this information on the manufacturer’s website.
What if I accidentally put the wrong gas in my lawn mower?
If you accidentally put the wrong type of gasoline in your lawn mower, do not run the engine. Instead, drain the tank and refill it with the correct type of gasoline. You can also add a fuel stabilizer to the tank to help prevent any problems caused by the incorrect fuel.
How often should I change the gas in my lawn mower?
It’s a good practice to change the gas in your lawn mower every 30 days, even if you haven’t used it. Gasoline can deteriorate over time, especially when exposed to air and heat. Changing the gas regularly will help to keep your mower running smoothly and prevent problems.