Keeping your Briggs & Stratton powered mower running smoothly starts with draining the old oil and refilling with the correct grade. Learning how to change oil on briggs and stratton lawn mower is a fundamental skill that extends the life of your engine and ensures reliable performance season after season. This guide provides clear, step-by-step instructions to make the process straightforward, even if you’ve never done it before.
How To Change Oil On Briggs And Stratton Lawn Mower
Changing the oil in your Briggs & Stratton engine is a simple maintenance task that pays off in big ways. Regular oil changes remove abrasive particles and old, broken-down lubricant, preventing wear on critical engine components like the piston and crankshaft. By following a systematic approach, you can complete this job in under 30 minutes with just a few basic tools.
Tools And Materials You Will Need
Before you begin, gather all necessary items. Having everything at hand makes the process faster and prevents you from having to stop midway. You likely already own most of these tools.
- Fresh SAE 30 or 10W-30 motor oil (check your owner’s manual for the specific grade)
- A new oil filter (if your engine model is equipped with one)
- A drain pan or shallow container to catch the used oil
- A funnel
- Clean rags or paper towels
- A socket wrench or adjustable wrench
- A pair of safety gloves
- Newspaper or cardboard to protect your work area
Safety Precautions Before You Start
Your safety and the safety of your equipment are paramount. Never overlook these critical steps, as they prevent accidents and ensure the job is done correctly.
- Allow the engine to cool completely. Draining hot oil can cause serious burns.
- Disconnect the spark plug wire. This prevents the engine from accidentally starting while you are working on it.
- Work on a flat, level surface to ensure all the old oil drains out properly.
- Have a plan for disposing of the used oil. Never pour it on the ground or into a drain. Most auto parts stores accept used oil for recycling.
Preparing Your Lawn Mower
Proper preparation sets the stage for a clean and efficient oil change. Start by moving your mower to your protected work area. Position it so the oil fill and drain areas are easily accessible. Wipe away any grass clippings or debris from around the oil fill cap and the base of the engine. This prevents dirt from falling into the engine when you open it.
Step-By-Step Oil Change Process
Now, let’s walk through the core process. Follow these steps in order for the best results.
Step 1: Locate The Drain Plug And Oil Fill Tube
First, identify the drain plug on your Briggs & Stratton engine. It is typically located on the side or bottom of the engine crankcase. It may be a square-head plug or a bolt. The oil fill tube is usually on the top of the engine, capped with a dipstick. If you’re unsure, consult your mower’s manual for a diagram.
Step 2: Drain The Old Engine Oil
Place your drain pan directly beneath the drain plug. Using your wrench, carefully loosen and remove the plug. Allow the oil to drain completely into the pan. Tip the mower gently if needed to help the oil flow out, but avoid tipping it too far, as fuel or oil may leak from other areas. Once drained, clean the drain plug and its threads with a rag before reinstalling it securely. Do not overtighten it.
Step 3: Replace The Oil Filter (If Equipped)
Some Briggs & Stratton engines have a spin-on oil filter. If yours does, locate it. Place the drain pan underneath it to catch any residual oil. Use an oil filter wrench to turn the old filter counterclockwise and remove it. Before installing the new filter, apply a thin layer of fresh 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 gasket.
Step 4: Refill With New Oil
Locate the oil fill tube and remove the dipstick. Insert your funnel. Slowly pour in the recommended type and amount of new oil. Most Briggs & Stratton engines hold between 18 to 20 ounces, but always check your manual for the exact capacity. It is better to add less initially, check the level, and then add more if needed. Overfilling can be just as harmful as running the engine with low oil.
Step 5: Check The Oil Level
After adding most of the oil, wait a minute for it to settle in the crankcase. Insert the dipstick fully, then remove it to check the level. The oil should be between the “Full” and “Add” marks on the dipstick. Add small amounts of oil as necessary until the level is correct. Once full, securely replace the oil fill cap and dipstick.
Step 6: Run The Engine And Check For Leaks
Reconnect the spark plug wire. Start the engine and let it run for about 30 seconds. This circulates the new oil throughout the engine. Then, turn the engine off and wait a minute. Carefully inspect the area around the drain plug and oil filter for any signs of leaks. If you see a leak, turn off the engine immediately and check the tightness of the plug or filter.
Choosing The Correct Oil For Your Engine
Using the right oil is crucial for engine protection. Briggs & Stratton recommends using detergent oils classified as API Service Class SJ or higher. The viscosity, or thickness, of the oil depends on the temperature in your area.
- SAE 30: Best for consistent temperatures above 40°F (4°C). It’s a common choice for summer mowing.
- 10W-30: A good multi-viscosity oil for variable temperatures. It provides easier starting in cooler weather.
- Synthetic Blends: These can offer better performance and longer intervals between changes, but check your manual for approval.
Always avoid using automotive oil additives or mystery oils. Stick with a quality brand meant for small engines.
Disposing Of Used Oil And Filter Properly
Proper disposal is an environmental responsibility. Used motor oil is a hazardous contaminant. Pour the cooled, used oil from your drain pan into a clean, sealable container like the original oil bottle. Take the used oil and the old filter (sealed in a plastic bag) to a certified collection center. Many service stations, auto parts stores, and recycling centers offer this service for free. Never dispose of it with your regular household trash.
Common Mistakes To Avoid
Being aware of common pitfalls helps you complete the job correctly the first time. Here are a few errors to steer clear of.
- Changing the oil while the engine is hot, risking burns.
- Forgetting to reconnect the spark plug wire after the change.
- Over-tightening the drain plug or oil filter, which can strip threads.
- Overfilling the engine with oil, which can cause smoking and performance issues.
- Using the wrong type of oil, which may not provide adequate lubrication.
- Not disposing of the old oil responsibly.
When To Change Your Lawn Mower Oil
Regular intervals are key. A good rule of thumb is to change the oil after the first 5 hours of use on a new engine, and then at least once every mowing season or every 50 hours of operation, whichever comes first. If you use your mower in dusty conditions or for extended periods, consider changing it more frequently. If the oil appears very dark and dirty before the season is over, it’s a sign it needs changing sooner.
FAQ Section
Here are answers to some frequently asked questions about changing oil in Briggs and Stratton mowers.
How Often Should I Change The Oil In My Briggs And Stratton Mower?
You should change the oil after the first 5 hours of break-in use. After that, change it once per season or every 50 hours of operation. Always check your owner’s manual for the manufacturer’s specific recommendation for your model.
Can I Use Synthetic Oil In My Briggs And Stratton Lawn Mower?
Yes, many modern Briggs & Stratton engines can use synthetic oil. It often provides better protection in extreme temperatures and can extend the time between oil changes. However, you should confirm this in your engine’s manual before switching.
What Happens If I Overfill The Oil?
Overfilling can cause the oil to foam, leading to inadequate lubrication and increased pressure. This may result in hard starting, excessive smoke from the exhaust, and potential engine damage. If you overfill, you must drain the excess oil to the proper level.
Where Is The Oil Drain Plug On A Briggs And Stratton Engine?
The drain plug is usually located on the side or bottom of the engine crankcase. It is often a square-head plug or a bolt. Some newer models have a special drain valve or tube to make the process cleaner. Refering to your manual will give you the exact location.
Do I Need To Change The Oil Filter Every Time?
Yes, if your engine has an oil filter, it should be replaced every time you change the oil. The filter traps contaminants, and a used filter is clogged and ineffective. Replacing it ensures your new oil stays clean longer.