Learning how to change oil in lawn mower Briggs and Stratton is a key maintenance task that keeps your engine running smoothly for years. Briggs & Stratton engines are common, and changing their oil requires knowing the specific oil capacity of your model. This guide provides clear, step-by-step instructions to make the process simple and mess-free.
Regular oil changes remove dirt and metal particles that cause wear. Doing this yourself saves money and time. You only need a few basic tools and about 30 minutes.
How To Change Oil In Lawn Mower Briggs And Stratton
This section covers the complete oil change procedure. Always refer to your engine’s manual for the most accurate specifications for your specific model. Safety is the first priority, so let’s start with gathering what you’ll need.
Tools And Materials You Will Need
Having everything ready before you start makes the job quicker. You likely have most of these items already in your garage.
- Fresh SAE 30 or 10W-30 lawn mower oil (check your manual)
- An oil drain pan or old container
- A funnel
- Clean rags or paper towels
- A socket wrench or adjustable wrench
- Gloves to keep your hands clean
- New oil filter (if your model has one)
- Oil filter wrench (if needed)
Safety Precautions Before You Begin
Always take these safety steps to prevent accidents and injuries. A cool engine is essential for a safe oil change.
- Run the mower for a few minutes to warm the oil, then turn it off and let the engine cool completely. Warm oil flows better, but a hot engine is a burn risk.
- Disconnect the spark plug wire. This prevents the engine from accidentally starting while you work.
- Work on a flat, level surface to ensure all the old oil drains out properly.
- Have a container ready for the used oil. You must dispose of it at a recycling center; never pour it on the ground or in the trash.
Locating Your Model Number
Your engine’s model number is crucial for finding the correct oil type and capacity. You can usually find it stamped on the valve cover or on a sticker on the engine housing. Write this number down for reference.
Step-By-Step Oil Change Instructions
Follow these steps in order for a successful oil change. Take your time, especially if this is your first time performing this maintenance.
Step 1: Drain The Old Oil
There are two common methods to drain oil from a Briggs and Stratton mower: using a drain plug or tipping the mower. The drain plug method is preferred and cleaner.
- Locate the drain plug on the side or bottom of the engine crankcase. Place your drain pan directly underneath it.
- Using your wrench, carefully loosen and remove the drain plug. Allow the oil to drain completely into the pan. This may take several minutes.
- If your model lacks a drain plug, you may need to carefully tip the mower on its side with the air filter and carburetor facing up. Tip the mower so the oil pours out of the fill tube into your pan. Be very cautious not to spill fuel or oil into the air filter.
- Once drained, clean the drain plug and reinstall it securely. Do not overtighten it.
Step 2: Replace The Oil Filter (If Equipped)
Some Briggs and Stratton engines have a spin-on oil filter. Changing it with every oil change is recommended for best engine protection.
- Place the drain pan under the filter location.
- Use an oil filter wrench to loosen the old filter. Turn it counter-clockwise.
- Before installing the new filter, apply a thin layer of clean oil to the rubber gasket on the top of the new filter.
- Screw the new filter on by hand until the gasket makes contact, then tighten it an additional three-quarter turn. Do not use the wrench for the final tighten, as this can damage the seal.
Step 3: Add The New Oil
Now you can add fresh oil to your engine. Using the correct amount is vital for proper lubrication.
- Locate the oil fill tube. It usually has a dipstick attached to the cap.
- Insert your funnel into the fill tube.
- Slowly pour in about three-quarters of the recommended oil capacity for your engine. You can find the exact capacity in your manual or by using your model number online.
- Wait a minute for the oil to settle, then check the dipstick. Wipe it clean, reinsert it fully, and pull it out again to check the level.
- Add small amounts of oil until the level reaches the “Full” mark on the dipstick. Never overfill the engine, as this can cause performance issues.
- Securely replace the oil fill cap.
Step 4: Final Checks And Cleanup
You’re almost done. These final steps ensure everything is working correctly and tidy up your work area.
- Reconnect the spark plug wire to the spark plug.
- Start the mower and let it run for about a minute. This circulates the new oil. Listen for any unusual noises.
- Turn off the engine and wait another minute. Check for any leaks around the drain plug or oil filter.
- Check the oil level one more time with the dipstick and add a bit more if needed.
- Pour the used oil from your drain pan into a sealed container for recycling. Most auto parts stores accept used oil for free.
Choosing The Correct Oil For Your Engine
Using the right oil protects your engine from excessive wear. Modern Briggs and Stratton engines typically use one of two types.
- SAE 30: A common single-weight oil recommended for warmer temperatures (above 40°F).
- 10W-30: A multi-viscosity oil that works well in a wider temperature range, especially if you have cool spring and fall seasons.
Always look for oil that meets the API service classification SJ or later. Many brands offer oil specifically labeled for small engines, which is a good choice. Your engine’s manual is the final authority on oil type.
Understanding Oil Capacity And Change Intervals
Oil capacity varies by engine model. Most common Briggs and Stratton push mower engines hold around 20 ounces (approximately 0.6 quarts), while larger riding mower engines can hold 48 ounces (1.5 quarts) or more.
As a general rule, you should change the oil after the first 5 hours of operation on a new engine. After that, change it every 50 hours of use or at least once per mowing season. If you use your mower in dusty conditions, more frequent changes are a good idea.
Troubleshooting Common Oil Change Issues
Sometimes, things don’t go perfectly. Here are solutions to a few common problems.
Oil Leaks After The Change
If you notice a leak, first check that the drain plug and oil filter are tightened properly. Wipe the area clean and run the engine briefly to identify the exact source. A damaged drain plug gasket or a cross-threaded filter can cause leaks.
Overfilling Or Underfilling The Oil
Overfilling can cause smoking and hard starting. If you added to much oil, you must drain the excess. You can use a suction pump or carefully loosen the drain plug to let some out. Underfilling is just as bad, as it leads to poor lubrication. Always use the dipstick to get the level just right.
Old Oil Won’t Drain Completely
If the oil seems slow to drain, it might be cold or viscous. Remember to warm up the engine slightly before draining. Also, ensure the mower is on a level surface and that the drain hole is not obstructed by debris.
Frequently Asked Questions
Here are answers to some of the most common questions about Briggs and Stratton oil changes.
How Often Should I Change The Oil In My Briggs And Stratton Mower?
Change the oil after the first 5 hours of use for a new engine. Thereafter, change it every 50 hours of operation or once per mowing season, whichever comes first. In harsh conditions, change it more frequently.
Can I Use Automotive Oil In My Lawn Mower?
It is not recommended. Many automotive oils contain additives that can harm small engine components. Always use oil that is certified for small engines or explicitly recommended by Briggs and Stratton for your model.
What Is The Easiest Way To Change Lawn Mower Oil?
The easiest method is to use the engine’s drain plug if it has one. For mowers without a plug, a fluid extractor pump that sucks the oil out through the fill tube can be a clean and simple alternative to tipping the mower.
Where Is The Drain Plug On A Briggs And Stratton Engine?
The drain plug is typically located on the side or bottom of the engine crankcase. It often looks like a large bolt or a square-headed plug. Consult your owner’s manual for the exact location on your specific engine model.
How Do You Dispose Of Used Lawn Mower Oil?
Used motor oil is a pollutant and must be disposed of properly. Pour the cooled oil into a clean, leak-proof container with a sealable lid. Take it to an automotive service center, parts store, or a local household hazardous waste facility that offers oil recycling. They will accept it for free.
Changing the oil in your Briggs and Stratton lawn mower is a straightforward task that has a huge impact on your mower’s lifespan and performance. By following these steps, using the correct oil, and maintaining a regular schedule, you ensure your engine stays healthy for many mowing seasons. Remember to always prioritize safety by disconnecting the spark plug and working with a cool engine. With a little practice, this job will become a quick and easy part of your seasonal routine.