Learning how to change oil on a Craftsman lawn mower is a fundamental skill that saves you time and money. The process to change oil on a Craftsman mower is manageable for most DIY enthusiasts. With a few basic tools and about 30 minutes, you can complete this essential maintenance task and ensure your mower runs smoothly for seasons to come.
Regular oil changes are the single most important thing you can do for your mower’s engine. Fresh oil lubricates moving parts, reduces wear, and helps dissipate heat. Neglecting this simple service can lead to poor performance and costly repairs.
This guide provides clear, step-by-step instructions. We will cover everything from gathering supplies to disposing of the old oil properly.
How To Change Oil On Craftsman Lawn Mower
Before you begin, it’s crucial to gather all necessary materials and prepare your workspace. Having everything on hand makes the job faster and cleaner. You will also need to consult your owner’s manual for model-specific details, as procedures can vary slightly.
The core steps involve warming the engine, draining the old oil, replacing the filter if your model has one, and adding new oil. Always work on a level surface and allow the engine to cool slightly before starting to avoid burns.
Tools And Materials You Will Need
You do not need specialized automotive tools for this job. Most items are likely already in your garage or can be purchased inexpensively at any hardware store.
- Fresh SAE 30 or 10W-30 detergent motor oil (Check your manual for the correct type and quantity, usually about 20 oz.)
- A new oil filter (if your Craftsman mower is equipped with one)
- An oil drain pan or shallow container
- A funnel
- Clean rags or paper towels
- A socket wrench or adjustable wrench
- Gloves to keep your hands clean
- Safety glasses are recommended
Preparing Your Lawn Mower For Service
Proper preparation ensures a smooth and safe oil change. Never attempt to drain oil immediately after mowing, as the engine and oil will be extremely hot.
First, run the engine for 5-10 minutes to warm the oil. Warm oil flows out more easily, carrying more contaminants with it. Then, turn off the engine and disconnect the spark plug wire. This is a critical safety step that prevents the engine from accidentally starting.
Move the mower to a flat, level surface like your driveway or garage floor. Clean any grass clippings or debris from around the oil fill cap and dipstick area to prevent dirt from falling into the engine during the process.
Locating The Drain Plug And Oil Fill
On most Craftsman walk-behind mowers, the oil drain plug is located on the side or bottom of the engine deck. The oil fill tube is typically on the top of the engine, often marked with an oil can symbol. If you cannot find the drain plug, refer to your manual; some models may use a siphon method through the fill tube.
Step-By-Step Oil Drainage Process
This is the core of the procedure. Take your time to ensure all the old oil is removed. Place your drain pan directly beneath the drain plug area, anticipating the flow of oil.
- Place the oil drain pan under the engine’s drain plug.
- Using your wrench, carefully loosen and remove the drain plug. Be prepared for oil to begin flowing immediately.
- Allow the oil to drain completely into the pan. This may take several minutes. Tip the mower gently from side to side to encourage all the old oil to exit.
- Once drained, wipe the drain plug area clean and reinstall the plug. Tighten it securely, but avoid overtightening which can strip the threads.
Replacing The Oil Filter (If Applicable)
Many Craftsman riding mowers and some newer walk-behind models have a spin-on oil filter. Changing this filter is just as important as changing the oil, as it traps harmful particles.
If your mower has a filter, you will find it mounted on the side of the engine. Place your drain pan underneath it, as oil will spill out when it’s removed. Use an oil filter wrench to turn the old filter counterclockwise until it loosens.
Before installing the new filter, dip your finger in the new oil and lightly coat the rubber gasket on the top of the new filter. This ensures a proper seal. 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.
Adding The New Engine Oil
Now you are ready to add fresh, clean oil to your mower’s engine. This step is straightforward but requires attention to avoid overfilling, which can be as damaging as running on low oil.
- Insert a clean funnel into the oil fill tube.
- Slowly pour in the recommended type and amount of oil. It is better to pour slightly less than the full capacity initially.
- Wait a minute for the oil to settle, then remove the funnel and wipe the area.
- Insert the dipstick fully, then remove it to check the oil level. The oil should be between the “Full” and “Add” marks on the dipstick.
- Add small amounts of oil as needed, checking the dipstick after each addition, until the level is correct.
- Once filled, replace the oil fill cap or dipstick securely.
Final Checks And Cleanup
Your oil change is almost complete. A few final steps will ensure everything is in working order and your workspace is left clean.
Reconnect the spark plug wire that you disconnected earlier. Start the engine and let it run for about a minute. This circulates the new oil throughout the engine. While it runs, check carefully 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.
After confirming no leaks, turn off the engine. Give it a moment, then check the oil level one final time with the dipstick, as some oil may have circulated into the filter. Top up if necessary. Finally, pour the used oil from your drain pan into a sealed container, like the empty new oil bottle, for proper disposal.
Choosing The Correct Oil Type
Using the wrong oil can affect engine performance and longevity. Most Craftsman lawn mower engines use standard SAE 30 weight oil for warmer temperatures or 10W-30 for a wider temperature range.
Always check your owner’s manual for the manufacturer’s specific recommendation. Look for oil labeled for “small engines” or “lawn mower use.” These often have additives beneficial for air-cooled engines. Do not use automotive oil labeled “Energy Conserving,” as it can harm small engines.
Proper Disposal Of Used Oil And Filter
Never pour used motor oil on the ground, into a drain, or throw it in the trash. Used oil is a major pollutant. Fortunately, recycling it is easy and often free.
Transfer the cooled, used oil from your drain pan into a clean, leak-proof container with a screw-top lid. Many auto parts stores, service stations, and recycling centers accept used oil and filters at no charge. Some locations may have limits on quantity, so it’s good to call ahead. This simple act protects the environment.
Common Mistakes To Avoid
Being aware of common pitfalls can help you complete the job correctly the first time. Here are a few key errors to steer clear of.
- Overfilling the oil: This causes excess pressure and can lead to oil blowing out of the engine, creating a mess and potential damage.
- Not changing the filter: If your mower has a filter, always replace it with the oil. A clogged filter restricts oil flow.
- Using the wrong oil type: Stick to the manual’s specifications for optimal engine protection.
- Forgetting to reconnect the spark plug: This obvious step is sometimes overlooked after the job is done.
- Overtightening the drain plug or filter: This can strip threads or crush gaskets, leading to leaks.
Maintenance Schedule And Tips
Changing the oil is part of a broader maintenance routine that keeps your Craftsman mower reliable. A consistent schedule prevents most major problems.
Recommended Oil Change Frequency
A good rule of thumb is to change the oil every 25-50 hours of operation or at least once per mowing season. If you use your mower heavily or in dusty conditions, change it more frequently. Always perform an oil change at the beginning of the mowing season for a fresh start.
Complementary Maintenance Tasks
While you have the mower prepared for service, it’s efficient to perform a few other quick checks. This proactive approach saves you time later.
- Sharpen or replace the mower blade: A sharp blade cuts grass cleanly, promoting a healthier lawn.
- Check the air filter: A dirty air filter restricts airflow to the engine. Clean or replace it as needed.
- Inspect the spark plug: Remove it and check for excessive wear or carbon buildup. Replace it if it looks worn or according to the manual’s schedule.
- Check tire pressure: Properly inflated tires ensure even cutting and easier handling.
Frequently Asked Questions
How Often Should I Change The Oil In My Craftsman Mower?
You should change the oil in your Craftsman lawn mower after the first 5 hours of use for a new engine, then every 25-50 hours of operation thereafter. At a minimum, change the oil once per mowing season, even if you haven’t reached the hour threshold.
Can I Use Synthetic Oil In My Craftsman Lawn Mower?
Yes, you can use synthetic oil in your Craftsman mower if it meets the viscosity grade specified in your owner’s manual (e.g., SAE 30 or 10W-30). Synthetic oils often provide better protection in extreme temperatures and can extend intervals between changes, but always follow the manufacturer’s primary recommendations.
Where Is The Oil Drain Plug On A Craftsman Mower?
The oil drain plug location varies by model. On most walk-behind mowers, it is on the side of the engine deck, near the base. On riding mowers, it is typically on the bottom of the engine oil pan. The best resource is your specific model’s owner’s manual for an exact diagram.
What Is The Best Way To Drain Oil If My Mower Has No Drain Plug?
Some older or smaller Craftsman mowers lack a drain plug. For these models, you must use a siphon pump or a simple method of tilting the mower. Carefully tip the mower on its side (with the air filter and carburetor facing up to prevent oil from flooding them) and pour the old oil out through the fill tube into your drain pan.
How Much Oil Does A Craftsman Lawn Mower Take?
The oil capacity for a Craftsman walk-behind mower is usually around 18 to 20 ounces (approximately 0.6 quarts). Riding mowers hold more, typically 48 to 64 ounces (1.5 to 2 quarts). Always check the dipstick during filling rather than relying solely on the stated capacity, as residual oil remains in the engine.