Changing your lawn mower’s oil is easy. I’ll show you the 5-step process I use when I regularly change the oil on the mowers I use to cut customers’ lawns here in Virginia Beach.
With the correct oil and a few basic tools, most homeowners can handle this maintenance task in under half an hour.
Most push mowers need an oil change every 50 hours or once per season. Riding mowers typically require an oil change every 100 hours or once per season.
Changing the oil is one of the simplest and most effective ways to extend engine life and prevent costly repairs.
| Skill level: Beginner Estimated time: 15 to 30 minutes Cost: $11 and $80, depending on whether you need filters or if you buy an oil extractor |
What you’ll need:
*You won’t need every item listed. It depends on your mower.
| Required | Optional |
|---|---|
| • Correct engine oil (check the sticker on the mower or the owner’s manual) | • Wrench or socket (if your mower has a drain plug) |
| • Oil drain pan | • Oil extractor |
| • Funnel | • New oil filter (mostly riding mowers) |
| • Rags or paper towels | • Gloves |
| • Cardboard or plastic to protect the ground |
Step 1: Prep your lawn mower
Park your lawn mower on level ground. Run the engine for 5–10 minutes to warm the oil, then shut it off and allow it to cool completely. Disconnect the spark plug wire or remove the battery to prevent accidental starts.
Read more: Best Lawn Mower Maintenance Practices
Step 2: Drain the old oil
I’ll detail three common methods to drain the old oil: using the drain plug (mostly for riding mowers), tilting your mower to its side (mostly or push mowers), or using an oil extractor (works for any mower).
Use the drain plug (best for riding mowers)
Depending on your lawn mower’s design, the oil drain plug is commonly found beneath the mower deck or at the bottom of the engine block, often near the crankshaft.
Place a drain pan under the plug, use a wrench to remove the plug, and allow the oil to drain completely into the pan. Reinstall the plug and tighten it snugly. Wipe up any spills and transfer the used oil to a sealed container.
Tip the lawn mower (best for most push mowers)
Always tip the mower with the air filter and carburetor facing up. (This keeps oil from spilling into them.)
Remove the oil cap or dipstick (use a wrench, if needed)and drain the oil into a pan.
Set the mower back level once empty.
Wipe up any spills and transfer the used oil into a sealed container.
Oil extractor (any mower)
Remove the dipstick, insert the extractor tube to the bottom of the oil reservoir, and pump the oil out.
Transfer the used oil into a sealed container.
Important note: Never dump your lawn mower’s used motor oil on the ground, in the trash, down the drain, or into storm sewers. Used motor oil is hazardous waste. In accordance with EPA guidelines, it must be disposed of at a certified recycling or collection facility. Instead, store your used oil in a clean, labeled container, and once it’s full, take it to a recycling location. Many auto parts stores, municipal waste collection centers, and gas stations also accept used oil.
Step 3: Add new oil
Use the oil sticker on the mower or engine as your primary guide. Most mowers clearly list the correct oil type, oil capacity, and proper fill level. This information should always take priority.
If you can’t find the manual or a label on your lawn mower, use this guide based on the type of engine and your climate:
| Oil Type | Best for | Characteristics |
| SAE 30 | Small engines, push mowers | This oil is used in warm weather (40 degrees and above) |
| 10W-30 | Push mowers, riding mowers | Good for warm and cold weather |
| Synthetic 5W-30 | High-performance mowers | Performs in all temperatures |
| 15W-50 | Heavy-duty or racing mowers | Hot climates and heavy workloads |
Place a funnel into the oil fill opening. Slowly pour the recommended amount of oil. Push mowers typically take 15 to 20 ounces, while riding mowers need 48 to 64 ounces.
If you’re unsure how much oil you’ve added, you can easily check with the dipstick: Remove it and wipe it clean, insert it again, and pull it out. The oil mark on the dipstick should be between the Low and Full levels.
Add more oil if needed and recheck with the dipstick.
Don’t overfill. Too much oil can cause smoking, leaks, or engine damage.
Note: Dipsticks are accurate, but only when dipsticks are checked correctly.
Step 4: Change the oil filter (if equipped)
If your lawn mower has an oil filter, you should replace the oil filter whenever you change the oil. Oil filters are commonly found on riding mowers and some high-end push mowers. Push mowers with small engines usually don’t have an oil filter.
First, locate the oil filter, which is usually near the engine on riding mowers or close to the oil fill cap on push mowers.
Place a drain pan underneath, as some oil may spill during removal.
Next, turn the filter counterclockwise to unscrew it. If it’s stuck, use an oil filter wrench for extra grip. Apply a small amount of fresh oil to the rubber gasket. This helps create a proper seal and makes removal easier next time.
Finally, screw in the new filter by turning it clockwise until snug but don’t overtighten, as this can damage the gasket.
Note: Some engines recommend pre-filling the filter; check your manual.
Step 5: Final check
Make sure the oil filler cap is securely tightened, then reconnect the spark plug wire or reinstall the battery if you removed it earlier.
Then, start the engine and let it run for 2 or 3 minutes. This helps the new oil circulate through the engine and ensures everything works properly. After shutting off the mower, check for any leaks around the drain plug and oil filter.
Finally, recheck the oil level using the dipstick. Running the engine may cause the oil level to drop a little. If needed, add a little more oil to bring it to the full mark.
Mechanic’s FYI
Changing your oil at the manufacturer’s recommended intervals can easily double the life of your mower’s engine. Skipping oil changes is one of the fastest ways to destroy an otherwise good mower.
If you’re uncomfortable doing this yourself, a local small-engine mechanic can usually handle an oil change quickly and affordably.
FAQ About Changing Oil in Your Lawn Mower
A small amount of smoke right after an oil change is normal. It’s usually oil residue burning off the engine. Let the mower run for a few minutes and the smoke should clear.
Persistent smoke usually means the engine was overfilled with oil. Shut the mower off and recheck the oil level using the mower’s sticker or manual.
Not always. Dipsticks can give misleading readings if the mower isn’t level, the engine is warm, or the dipstick isn’t used correctly. Always prioritize the mower’s oil sticker or manual.
Yes. Even low-hour mowers benefit from fresh oil. Old oil breaks down and carries contaminants that shorten engine life.
Find a lawn care pro in your area
Regular lawn mower oil changes ensure your lawn mower runs efficiently and lasts for years. A well-maintained mower makes yard work easier. If you ever need help mowing your lawn, fertilizing, or controlling weeds, Lawn Love can connect you with a professional in your area.
Read next:
How Often Should You Sharpen Lawn Mower Blades?
How to Sharpen Lawn Mower Blades
Main Image: Checking the oil level on a lawn mower with a dipstick. Photo Credit: romarti / Adobe Stock
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