Troubleshooting Lawnmower Oil Burn: How To Fix It

Quick Answer: If your lawnmower is burning oil, it’s important to address the issue promptly to prevent further damage. The most common causes of this problem are a worn piston ring or a faulty valve seal. To fix it, start by checking the oil level and ensuring it is not overfilled. Then, inspect the spark plug for oil fouling and replace if necessary. If the issue persists, it may be necessary to replace the piston ring or valve seal. Regular maintenance, such as using the correct type of oil and cleaning or replacing the air filter, can help prevent future oil burning.

Introduction: Is your lawnmower leaving behind a cloud of blue smoke and a foul smell? If so, it’s likely burning oil, and this can be a cause for concern. But fear not, as we have some simple tips to help you fix this issue. In this article, we’ll explore the common causes of lawnmower oil burning and provide you with practical solutions to resolve it. From checking the oil level to replacing worn-out parts, we’ll guide you through the necessary steps to get your lawnmower running smoothly again. So, let’s dive right in and discover how you can put an end to that annoying smoke and get your lawn looking pristine once more.

Troubleshooting Lawnmower Oil Burn: How to Fix It

Lawnmower Burning Oil? How to Fix it


Burning oil is a common issue that many lawnmower owners encounter. Not only does it create unpleasant smoke and exhaust fumes, but it can also lead to engine damage if left unaddressed. In this article, we will explore the causes of a lawnmower burning oil and provide you with effective solutions to fix the problem.

Understanding the Causes

1. Worn Piston Rings

Piston rings are responsible for sealing the combustion chamber, preventing oil from entering. Over time, these rings can wear out or become damaged, allowing oil to leak into the cylinder and burn during the combustion process.

2. Valve Seal Issues

Valve seals regulate the flow of oil to the cylinder head. When these seals deteriorate or fail, oil can seep into the combustion chamber, resulting in oil burning and smoke emissions.

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3. Clogged Breather Tube

A clogged or blocked breather tube can disrupt the air intake system, leading to increased pressure inside the crankcase. This excess pressure can cause oil to be forced into the combustion chamber, resulting in burning oil.

4. Overfilled Oil Level

If the lawnmower’s oil reservoir is overfilled, excess oil can be forced into the combustion chamber, leading to oil burning. It is crucial to maintain the correct oil level to prevent this issue.

Fixing Lawnmower Burning Oil

1. Inspect the Piston Rings

To check for worn or damaged piston rings, you will need to remove the spark plug and insert a compression tester into the spark plug hole. If the test reveals low compression, it indicates a problem with the piston rings. In such cases, it is best to replace the rings to prevent oil leakage and burning.

2. Replace the Valve Seals

If you suspect that faulty valve seals are causing your lawnmower to burn oil, you should remove the cylinder head and inspect the seals. Damaged or worn seals should be replaced to ensure proper oil flow and prevent oil from reaching the combustion chamber.

3. Clean or Replace the Breather Tube

Inspect the breather tube for any blockages or clogs. If necessary, remove and clean the tube thoroughly. If cleaning does not resolve the issue, consider replacing the breather tube altogether.

4. Adjust Oil Level

Check the lawnmower’s oil level and ensure it is within the recommended range. If the oil level is too high, drain the excess oil to prevent it from entering the combustion chamber.

5. Regular Maintenance

Preventive maintenance is crucial to avoid issues like burning oil. Regularly change the lawnmower’s oil and filter according to the manufacturer’s recommendations. Keep the air filter clean and inspect the engine for any signs of oil leaks.

6. Seek Professional Help

If you are unsure about diagnosing or fixing the issue yourself, it is always best to seek professional help. Experienced technicians can accurately identify the problem and implement the necessary repairs to resolve the burning oil issue.

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Dealing with a lawnmower that burns oil can be frustrating, but by understanding the causes and implementing the appropriate fixes, you can get your lawnmower back to its optimal performance. Regular maintenance and prompt attention to any oil-related issues will not only extend the lifespan of your lawnmower but also ensure a smoother and cleaner mowing experience. Remember to follow the manufacturer’s guidelines and seek professional assistance if needed, for a trouble-free lawnmower operation.

(Please note that this article is intended for informational purposes only and should not substitute professional advice. Always consult the manufacturer’s manual or a certified technician for specific guidance on your lawnmower.)

Why Is My Mower Smoking? Easy Explanation!

Frequently Asked Questions

Why is my lawnmower burning oil?

There can be several reasons why your lawnmower is burning oil. One possibility is that the oil level is too high, causing it to be forced into the combustion chamber and burned. Another possibility is that the piston rings or valve seals are worn out, allowing oil to leak into the combustion chamber. Lastly, a clogged or dirty air filter can cause the engine to run rich, leading to oil burning.

How can I fix my lawnmower burning oil?

To fix a lawnmower burning oil, you can try the following steps:

  1. Check the oil level: Ensure that the oil level is within the recommended range. If it’s too high, drain the excess oil.
  2. Inspect and replace worn piston rings or valve seals: If the piston rings or valve seals are worn out, they should be replaced to prevent oil leakage into the combustion chamber. Consult your lawnmower’s manual or a professional for guidance.
  3. Clean or replace the air filter: A clogged or dirty air filter can cause the engine to run rich, resulting in oil burning. Clean or replace the air filter to improve air circulation and fuel mixture.
  4. Perform regular maintenance: Ensure that you are following proper maintenance procedures, such as changing the oil regularly, using the recommended oil type, and keeping the engine clean. Neglecting maintenance can lead to oil burning issues.
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Can using the wrong type of oil cause my lawnmower to burn oil?

Using the wrong type of oil can potentially cause your lawnmower to burn oil. It’s essential to use the oil recommended by the manufacturer, as using the wrong viscosity or formulation can impact the engine’s performance and lead to oil consumption or burning. Always refer to your lawnmower’s manual for the correct oil specifications.

What are the signs that my lawnmower is burning oil?

There are a few signs that indicate your lawnmower is burning oil:

  • Excessive smoke from the exhaust: If you notice a thick, blue or white smoke coming from the lawnmower’s exhaust, it’s a clear indication of oil burning.
  • Increased oil consumption: If you find yourself frequently refilling the oil reservoir, it may be a sign that your lawnmower is burning oil.
  • Loss of power or performance: Oil burning can cause a decrease in engine performance, resulting in reduced power output or difficulty starting the lawnmower.

Should I attempt to fix the lawnmower burning oil issue myself?

If you are confident in your mechanical skills and have experience working on lawnmowers, you can attempt to fix the issue yourself. However, if you are unsure or inexperienced, it’s best to consult a professional or authorized service center. They have the expertise to diagnose and repair the problem effectively, ensuring the longevity and proper functioning of your lawnmower.

Final Thoughts

Is your lawnmower burning oil and leaving a trail of exhaust behind? Don’t worry, there are simple fixes to get your lawnmower back in shape. Start by checking the oil levels and ensuring they are at the correct amount. If the levels are too low, top it up with the recommended oil. Next, inspect the air filter and clean or replace it if necessary. Additionally, check the spark plug and clean or replace it as needed. Regular maintenance and proper care will keep your lawnmower running smoothly and prevent it from burning oil. So, if you’re dealing with a lawnmower burning oil, follow these steps to fix it and get back to a clean and efficient cutting experience.