How Often & How to Change Oil in a Lawn Mower

Like any other machine, Lawnmowers require timely maintenance to ensure smooth functioning. A critical aspect of lawn mower maintenance is changing its oil regularly. In this guide, we will discuss when and how to change lawn mower oil for all models.

How Often Should You Change Your Lawn Mower Oil

Depending on what type of lawn mower you are using, here are the recommendations on when to change or add fresh oil to the mower.

  1. Frequency: As a general rule of thumb, you should change the oil in your lawn mower after every 25-50 operating hours or at least once a year, whichever comes first. However, this may vary depending on your mower’s usage and the manufacturer’s recommendations. Remember that heavier use or harsher conditions may require more frequent oil changes.
  2. Seasons: Another essential time to change the oil in your lawn mower is at the start of the mowing season or the end of the season, depending on your preference. This ensures that your mower remains in optimal condition for the next cutting season.
  3. Oil Color and Consistency: Visually inspect the oil in your lawn mower. If it appears dirty, dark, or thick, it’s time to change it for new oil, regardless of the hours used.\


  • For existing push mowers, replacing the oil at least once a season or after every 50 hours of use is recommended.
  • For riding mowers, it should be changed at least once a season or after every 100 hours of operation. This can be accomplished as part of your regular maintenance and repairs.

How to Change Oil in a Lawn Mower

Follow these simple steps to change the oil in your lawn mower:

Gather Necessary Tools

You’ll need a container for the used oil, a wrench, a funnel, a clean cloth, and new oil recommended for your lawn mower’s engine.

Prepare the Lawn Mower

  • Make sure the engine is cool.
  • Remove the spark plug wire to ensure the engine does not start accidentally.
  • Clean around the oil fill and drain locations to remove dirt and debris.

Drain the Old Oil

  • Locate the oil drain plug, which is usually situated at the bottom of the engine.
  • Place the container under the plug.
  • Use a wrench to remove the drain plug and allow the oil to flow into the container.
  • Once the oil is drained, replace and tighten the drain plug.

Add New Oil

  • Remove the oil fill cap or dipstick.
  • Place the funnel into the oil fill hole.
  • Slowly pour the recommended amount and type of new oil into the engine.
  • Periodically check the oil level with the dipstick to avoid over-filling.
  • Replace the oil fill cap or dipstick once the proper oil level is reached.

Dispose of the Used Oil

  • Transfer the used oil to a sealed container.
  • Dispose of the used oil at a local recycling center, auto store, or any designated facility that accepts used oil.

Reconnect the Spark Plug Wire

Reattach the spark plug wire to the spark plug after completing the oil change.

Now your lawn mower is ready to function efficiently with fresh oil in its engine. Remember to keep track of the hours used and perform regular maintenance as needed for optimal performance and longer mower life.

Why Changing Lawn Mowers Oil Level Necessary

Oil is vital to the proper functioning of your lawn mower’s engine. Its primary function is lubricating the engine’s moving parts and preventing excessive friction between them. This reduces wear and tear on the engine’s internal components, minimizing the chances of engine failure. Here’s how oil works within the machine:

  1. Lubrication: Oil forms a protective film between the engine’s moving parts, reducing friction and wear.
  2. Heat Dissipation: Oil absorbs and dissipates heat as it circulates in the engine, preventing overheating and subsequent damage.
  3. Fuel Efficiency: Proper oil levels and viscosity help to improve the engine’s overall performance and fuel efficiency.

Dangers of Improper Oil Levels

Improper oil levels can lead to various issues that negatively impact your lawn mower’s performance and lifespan. These issues include:

  1. Overheating: Insufficient oil can cause the engine to overheat due to excessive friction between its moving components. This can result in significant damages and, in worst-case scenarios, complete engine failure.
  2. Poor Fuel Efficiency: An improper oil level can negatively affect fuel efficiency, leading to increased expenses and a less economical lawn mower.
  3. Premature Wear: When the oil levels are too low, the engine’s internal components are subjected to increased wear and tear, which can shorten the lifespan of your lawn mower and necessitate costly repairs or replacements.

Best Oil For Lawn Mowers

Use the oil type recommended by your lawn mower’s manufacturer for optimal performance and longer engine life. Typically, this is a high-grade synthetic or conventional motor oil with an API rating of SG or higher. If you’re unsure of the best oil type for your mower, consult an experienced technician who can advise.

You can also visit our post-BEST OIL FOR LAWN MOWER. 

Helpful Maintenance Tips:

  • Monitor the air filter and replace it if necessary.
  • Clean or replace the spark plug annually to ensure optimal performance.
  • Check all bolts, nuts, screws, and other components for tightness.
  • Sharpen the mower blade regularly to keep your lawn looking its best.
  • Perform regular tune-ups as recommended by the manufacturer
  • Keep the fuel tank and carburetor clean to avoid any issues down the road.
  • Store your mower in a dry, covered area during off-season months.

Following these simple steps, you can keep your lawn mower running at peak efficiency for years.

Final Thoughts

Oil change on lawnmowers is an essential part of regular maintenance that should not be ignored. To ensure optimal performance and longer life for your mower, change the oil at least once a year or after every 25-50 hours of operation.

Follow the manufacturer’s recommendations regarding the type of oil to use, and refer to our guide on how to change lawn mower oil for detailed steps on completing this task safely and efficiently. If you’re still unsure what to do, consult an experienced technician. Don’t forget to properly dispose of the used oil at a designated facility that accepts it.

With regular oil changes in your lawn mower, you can enjoy smooth and reliable operation without any worries for many years.

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