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What type of gasoline for lawn mower?

Selecting the appropriate gasoline for your lawn mower is essential for ensuring optimal performance, longevity, and reliability. With various options available at gas stations, it’s crucial to understand the differences between gasoline types, their impact on engine performance, and the factors to consider when making your selection. In this comprehensive guide, we’ll explore the types of gasoline suitable for lawn mowers, the importance of fuel additives, storage considerations, and maintenance tips to keep your mower running smoothly.


Understanding Gasoline Types

1. Regular Unleaded Gasoline (87 Octane)

Regular unleaded gasoline with an octane rating of 87 is the most commonly used fuel for lawn mowers. It contains a blend of hydrocarbons suitable for small engines, providing sufficient combustion and power without the need for higher octane ratings.


2. Ethanol-Blended Gasoline (E10)

Ethanol-blended gasoline, often labeled as E10, contains up to 10% ethanol mixed with regular unleaded gasoline. While E10 is widely available and compatible with most lawn mowers, it’s essential to consider its potential drawbacks, such as increased moisture absorption and the risk of phase separation over time.


3. Non-Ethanol Gasoline (E0)

Non-ethanol gasoline, also known as E0, is gasoline without any ethanol content. This type of gasoline is preferred by some lawn mower owners due to its reduced risk of moisture absorption and phase separation, which can lead to carburetor issues and engine damage.

Factors to Consider When Choosing Gasoline

1. Manufacturer Recommendations

Consult your lawn mower’s owner’s manual for specific recommendations regarding the type of gasoline to use. Some manufacturers may advise against using ethanol-blended gasoline or recommend a minimum octane rating for optimal engine performance and longevity.

2. Engine Compatibility

Consider the type of engine in your lawn mower when selecting gasoline. While most small engines can run on regular unleaded gasoline or ethanol-blended gasoline without issues, certain high-performance or commercial-grade engines may require premium gasoline with a higher octane rating.

3. Ethanol Content

Evaluate the ethanol content of the gasoline options available in your area. While ethanol-blended gasoline is widespread and suitable for most lawn mowers, some owners prefer non-ethanol gasoline to minimize the risk of fuel-related problems, particularly in older or less frequently used equipment.

4. Price and Availability

Consider the cost and availability of different gasoline options in your area. While non-ethanol gasoline may offer benefits in terms of engine performance and stability, it is often more expensive and less readily available compared to ethanol-blended gasoline.

Importance of Fuel Additives

Fuel additives can enhance the performance and longevity of your lawn mower’s engine by addressing common issues such as fuel oxidation, carbon buildup, and corrosion. Consider using fuel additives designed specifically for small engines to maximize fuel efficiency, minimize emissions, and protect engine components.

1. Stabilizers

Fuel stabilizers help prevent fuel degradation and varnish buildup by inhibiting the formation of gum and resin deposits. Adding a fuel stabilizer to your gasoline can extend its shelf life, particularly during periods of extended storage or infrequent use.

2. Cleaners

Fuel cleaners or detergents help keep the fuel system clean by dissolving and removing deposits from carburetors, fuel injectors, and intake valves. Regular use of fuel cleaners can improve engine performance, reduce emissions, and extend the lifespan of engine components.

3. Corrosion Inhibitors

Corrosion inhibitors protect metal components in the fuel system from rust and corrosion caused by exposure to moisture or ethanol content. Incorporating a corrosion inhibitor into your gasoline can help prevent costly damage to fuel tanks, fuel lines, and carburetor components.

Proper Gasoline Storage

Proper gasoline storage is essential for maintaining fuel quality and preventing issues such as phase separation, fuel oxidation, and moisture absorption. Follow these guidelines to ensure the longevity and stability of your gasoline:

1. Use Sealed Containers

Store gasoline in tightly sealed, approved containers designed for fuel storage. Avoid using containers made of materials that can degrade or react with gasoline, such as certain types of plastic or metal.

2. Store in a Cool, Dry Location

Store gasoline in a cool, well-ventilated area away from direct sunlight, heat sources, and ignition hazards. Avoid storing gasoline indoors or near electrical equipment, appliances, or flame-producing devices.

3. Minimize Air Exposure

Minimize air exposure by filling gasoline containers to the recommended level and using containers with minimal headspace. Air exposure can accelerate fuel degradation and increase the risk of vapor buildup and explosion.

4. Rotate Fuel Supply

Rotate your gasoline supply regularly to ensure freshness and prevent the accumulation of stale or degraded fuel. Use older gasoline for lawn mowers and other outdoor power equipment before refilling with fresh fuel.

Maintenance Tips for Optimal Performance

In addition to using the right type of gasoline and employing fuel additives, proper maintenance is essential for ensuring the optimal performance and longevity of your lawn mower’s engine. Follow these maintenance tips to keep your mower running smoothly:

1. Regularly Replace Air Filters

Inspect and replace the air filter according to the manufacturer’s recommendations to ensure proper airflow and combustion within the engine. A clogged or dirty air filter can restrict airflow, leading to reduced engine performance and fuel efficiency.

2. Check and Replace Spark Plugs

Inspect the spark plugs periodically and replace them if they show signs of wear or fouling. Worn or fouled spark plugs can cause starting difficulties, misfires, and poor engine performance. Follow the manufacturer’s guidelines for spark plug replacement intervals.

3. Clean or Replace Fuel Filters

Clean or replace the fuel filter regularly to prevent contaminants from entering the fuel system and causing clogs or damage. A clean fuel filter ensures proper fuel flow and combustion, improving engine performance and reliability.

4. Inspect and Adjust Carburetor

Periodically inspect the carburetor for signs of dirt, debris, or varnish buildup, and clean or adjust it as needed. A dirty or misadjusted carburetor can cause poor fuel combustion, rough idling, and stalling. Consider using a carburetor cleaner or professional carburetor cleaning service for thorough maintenance.

5. Drain Fuel System Before Storage

Before storing your lawn mower for an extended period, such as during the winter months, drain the fuel tank and run the engine until it stalls to remove any remaining fuel from the carburetor and fuel lines. Storing a lawn mower with fuel in the system can lead to fuel degradation, carburetor issues, and starting problems when it’s time to use the mower again.

6. Perform Regular Oil Changes

Change the engine oil and replace the oil filter according to the manufacturer’s recommendations to maintain proper lubrication and engine protection. Fresh, clean oil ensures smooth engine operation and prolongs the life of engine components.

7. Keep Blades Sharp and Balanced

Regularly inspect and sharpen the lawn mower blades to ensure clean, efficient cutting. Dull or unbalanced blades can result in uneven cutting, grass tearing, and increased fuel consumption. Sharpening blades as needed and balancing them properly helps maintain lawn health and reduces strain on the engine.

8. Store Lawn Mower Properly

When not in use, store your lawn mower in a clean, dry location protected from the elements. Cover the mower with a fitted cover to prevent dust, debris, and moisture from accumulating on the engine and other components. Proper storage prolongs the life of the mower and ensures it’s ready for use when needed.


Choosing the right type of gasoline for your lawn mower is crucial for maintaining optimal performance, reliability, and longevity. Whether you opt for regular unleaded gasoline, ethanol-blended gasoline, or non-ethanol gasoline, it’s essential to consider factors such as manufacturer recommendations, engine compatibility, and fuel additives to ensure proper fueling and engine operation.

By following proper gasoline storage practices, employing fuel additives, and performing regular maintenance, you can keep your lawn mower running smoothly season after season. From inspecting air filters and spark plugs to cleaning carburetors and sharpening blades, proactive maintenance helps prevent issues and prolongs the life of your lawn mower, ensuring a healthy and vibrant lawn for years to come.

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