Learning how to change Briggs and Stratton lawn mower oil is a key part of seasonal maintenance. Changing the oil in a Briggs & Stratton engine is a straightforward task with the right tools and fresh oil. This guide will walk you through the entire process safely and efficiently.
How To Change Briggs And Stratton Lawn Mower Oil
Regular oil changes are the simplest way to ensure your mower’s engine runs smoothly for years. Fresh oil lubricates internal parts, reduces wear, and helps dissapate heat. Neglecting this can lead to poor performance and costly repairs.
Tools And Materials You Will Need
Gathering everything before you start makes the job quicker. You likely have most of these items in your garage already.
- Fresh SAE 30 or 10W-30 motor oil (check your manual for the correct type and amount)
- An oil drain pan or old container
- A funnel
- Clean rags or paper towels
- A socket wrench or adjustable wrench
- A pair of gloves (optional but recommended)
- New oil filter (if your engine model has one)
- Oil filter wrench (if needed)
Safety Precautions Before You Begin
Your safety is paramount. Always follow these steps to prevent accidents or injury.
- Allow the engine to cool completely. Working on a hot engine can cause severe burns.
- Disconnect the spark plug wire. This prevents the engine from accidentally starting during the process.
- Work on a flat, level surface to ensure all the old oil drains out properly.
- Have a plan for disposing of the used oil responsibly. Most auto parts stores accept it for recycling.
Step-By-Step Oil Change Instructions
Follow these steps in order for a clean and complete oil change. Taking your time here is worth it.
Step 1: Locate The Oil Drain Plug And Dipstick
First, find the oil drain plug on the bottom of the engine crankcase. Also locate the oil fill tube and dipstick, usually on the top or side of the engine. Clean any grass or debris from around these areas.
Step 2: Drain The Old Engine Oil
Place your drain pan under the plug. Using your wrench, carefully loosen and remove the drain plug. Allow all the old, dirty oil to flow out into the pan. This may take a few minutes. Once drained, wipe the plug clean and reinstall it, tightening it securely but do not overtighten.
Step 3: Replace The Oil Filter (If Equipped)
Some Briggs and Stratton engines have a replaceable oil filter. If yours does, locate it. Place the drain pan underneath it. Use an oil filter wrench to turn the old filter counter-clockwise to remove it. Before installing the new filter, apply a thin layer of clean oil to the rubber gasket. Screw the new filter on by hand until the gasket contacts the base, then tighten it an additional three-quarter turn.
Step 4: Add The New Oil
Find the oil fill tube and remove the dipstick. Insert your funnel. Slowly pour in the recommended type and amount of new oil. It is better to add slightly less than the full amount, check the level, and then add more as needed. Overfilling can be just as harmful as running the engine with to little oil.
Step 5: Check The Oil Level
After adding oil, wait a moment for it to settle. Insert the dipstick fully, then remove it to check the level. Wipe it clean, re-insert it, and remove it again for an accurate reading. The oil should be between the “Full” and “Add” marks on the dipstick. Add small amounts if necessary until the level is correct.
Step 6: Reconnect The Spark Plug And Clean Up
Once the oil level is perfect, securely reattach the spark plug wire you disconnected earlier. Wipe up any spilled oil from the engine and your tools. Properly dispose of the old oil and filter at a recycling center. Do not pour it down a drain or on the ground.
Choosing The Correct Oil For Your Engine
Using the right oil is critical for engine health. For most Briggs & Stratton engines, a standard SAE 30 weight oil is recommended for temperatures above 40°F. For variable climates or use in both spring and fall, a multi-viscosity 10W-30 oil is often a good choice. Always defer to your engine’s specific manual for the manufacturers recommendation. Using synthetic oil can provide better protection in extreme temperatures.
How Often Should You Change The Oil?
A good rule of thumb is to change the oil every 50 hours of operation or at least once per mowing season. If you use your mower heavily or in dusty conditions, consider changing it more frequently. For new engines, check the manual for a specific break-in period oil change, which is often required after the first 5-8 hours of use.
Troubleshooting Common Oil Change Issues
Sometimes, things don’t go exactly as planned. Here are solutions to common problems.
Oil Drain Plug Is Stuck Or Stripped
If the drain plug won’t budge, do not force it. Apply a penetrating oil and let it sit for 15-20 minutes. Use a properly sized six-point socket for the best grip. If the plug is stripped, you may need to replace it, which is a relatively simple fix.
Engine Smokes After Oil Change
If you see smoke after starting the engine, you may have overfilled it. Check the oil level immediately and drain any excess if needed. Also, ensure you used the correct oil viscosity, as oil that is to thin can cause smoking.
Oil Leaks After The Change
Check that the drain plug and oil filter (if installed) are tightened correctly. Wipe the area clean and run the engine for a minute, then check for fresh leaks. A loose fill cap can also cause splattering that looks like a leak.
Frequently Asked Questions
What Type Of Oil Does A Briggs And Stratton Lawn Mower Use?
Most Briggs & Stratton engines use SAE 30 for warm weather or 10W-30 for varying temperatures. Always check your owner’s manual for the exact specification, as some newer models may recommend synthetic blend or full synthetic oil.
Can I Use Car Oil In My Lawn Mower?
It is not recommended. Automotive oils often contain additives that can harm small engines, particularly those with catalytic converters or designed for high mileage. Always use oil certified for small engine use, such as those marked with the API “SG” or higher service classification.
How Much Oil Does A Briggs And Stratton Mower Hold?
Oil capacity varies by engine model, typically ranging from 15 to 24 ounces (approximately 0.44 to 0.71 liters). The exact amount is usually stamped on the engine or listed in the manual. Always use the dipstick to confirm the final level rather than relying solely on the stated capacity.
Do You Change Lawn Mower Oil Hot Or Cold?
You should change the oil when the engine is warm, but not hot. A warm engine allows the oil to flow out more easily, carrying more contaminants with it. However, you must let the engine cool enough to safely touch the drain plug and other parts to avoid burns. A good compromise is to run the engine for a few minutes, then turn it off and wait 5-10 minutes before draining.
What Happens If You Don’t Change Your Lawn Mower Oil?
Old oil breaks down, becomes sludgy, and loses its ability to lubricate and protect. This leads to increased friction, overheating, accelerated engine wear, and eventually, complete engine failure. Regular changes are a small investment that prevents major repair costs.