Changing the oil on your Craftsman lawn mower is essential maintenance that keeps your engine running smoothly and extends its lifespan. The process involves warming the engine, safely draining the old oil, and refilling with the correct type and amount of fresh oil. While the basic steps are similar across models, the exact procedure varies depending on whether you have a push mower or riding mower, and which engine your specific Craftsman model uses.
This guide walks you through the entire oil change process, from safety preparations to final checks. Always consult your owner’s manual for model-specific instructions, oil capacity, and recommended oil viscosity, as these details vary by engine manufacturer.
Understanding Your Craftsman Mower Type
Before starting any oil change, identify whether you have a push mower or riding mower. This distinction matters because the oil draining process differs significantly between the two types.
Push Mowers
Craftsman push mowers typically use smaller engines (often Briggs & Stratton or Honda) with oil capacities ranging from 18 to 20 ounces. These mowers usually have either a drain plug on the bottom of the engine or require oil extraction through the dipstick tube using a pump. The oil type is commonly SAE 30 for warm weather or 10W-30 for variable temperatures.
Riding Mowers
Craftsman riding mowers have larger engines with greater oil capacity, often between 48 and 64 ounces depending on the engine model. Most riding mowers feature a drain plug located on the side or bottom of the engine. The oil type may be SAE 30, 10W-30, or 5W-30 depending on your engine manufacturer and climate conditions.
Safety Preparations Before Starting
Proper safety measures protect you from injury and prevent engine damage during the oil change process.
Warm Up the Engine
Run your mower for approximately five minutes before draining the oil. Warm oil flows more easily and carries suspended contaminants out of the engine more effectively than cold oil. However, be careful not to run the engine so long that it becomes too hot to handle safely.
Disconnect the Spark Plug
Always disconnect the spark plug wire before performing any maintenance. This prevents accidental engine startup while you are working near moving parts or with flammable materials. Locate the spark plug wire (usually a thick rubber boot) and pull it off the spark plug terminal.
Prepare Your Workspace
Work on a flat, level surface to ensure accurate oil level readings and prevent the mower from rolling. Place a drain pan or container beneath the oil drain point. Have clean rags, your new oil, and any tools you need within reach before beginning.
Step-by-Step Oil Draining Procedure
The draining process varies based on your mower type. Follow the instructions that match your Craftsman model.
Draining Oil from a Push Mower
Method 1: Using a Drain Plug
- Position your drain pan directly beneath the oil drain plug on the engine’s base.
- Using the appropriate wrench or socket, remove the drain plug by turning it counterclockwise.
- Allow all old oil to drain completely into the pan. This may take several minutes.
- Once drained, reinstall the drain plug and tighten it securely. Do not overtighten, as this can strip the threads.
Method 2: Extracting Through the Dipstick Tube
If your push mower does not have a drain plug, you will need an oil extraction pump:
- Remove the dipstick from the oil fill tube.
- Insert the extraction pump’s tube into the fill tube until it reaches the bottom of the oil reservoir.
- Pump the old oil into your drain container until the engine is empty.
- Remove the pump and proceed to refilling.
Draining Oil from a Riding Mower
- Locate the oil drain plug on your riding mower. This is typically found on the side or lower portion of the engine block.
- Place a drain pan with sufficient capacity beneath the plug.
- Remove the drain plug and allow the oil to flow out completely.
- Some models may have a drain valve instead of a plug. If yours has a valve, open it by turning the handle or pressing the release.
- After all oil has drained, close the valve or reinstall the plug securely.
Replacing the Oil Filter (If Equipped)
Not all Craftsman mowers have oil filters, but many riding mowers and some larger push mower engines do. Check your owner’s manual to determine if your model includes one.
When to Replace the Oil Filter
Most manufacturers recommend replacing the oil filter every other oil change or at least once per mowing season. If you notice reduced engine performance or have not changed the filter in over 50 hours of operation, replacement is advisable.
How to Replace the Oil Filter
- Locate the oil filter on your engine. It is typically a cylindrical canister mounted on the side of the engine block.
- Place a drain pan beneath the filter to catch any oil that may spill during removal.
- Using an oil filter wrench, turn the old filter counterclockwise to remove it.
- Before installing the new filter, apply a thin layer of clean oil to the rubber gasket on the new filter. This ensures a proper seal and makes future removal easier.
- Screw the new filter on by hand until the gasket contacts the mounting surface, then tighten an additional three-quarter turn by hand. Do not use a wrench to overtighten.
Refilling with New Oil and Final Checks
After draining the old oil and replacing the filter (if applicable), you are ready to add fresh oil.
Selecting the Correct Oil
Craftsman lawn mower engines typically require one of the following oil types:
- SAE 30: Best for warm weather conditions and consistent temperatures above 40 degrees Fahrenheit.
- 10W-30: A versatile option that performs well across a range of temperatures, making it suitable for variable climates.
- 5W-30: Recommended for cold weather starting in temperatures below 40 degrees Fahrenheit.
Always verify the recommended oil type in your owner’s manual. Using the wrong viscosity can affect engine performance and longevity.
Adding the New Oil
- Remove the oil fill cap or dipstick from the fill tube.
- Pour the new oil slowly into the fill tube. Start with slightly less than the recommended capacity to avoid overfilling.
- Check the oil level by inserting the dipstick fully, then removing it to read the level. The oil should be between the “add” and “full” marks.
- Add oil in small increments until the level reaches the full mark.
Final Steps
- Reinstall the oil fill cap or dipstick securely.
- Reconnect the spark plug wire.
- Start the engine and let it run for one to two minutes. This circulates the new oil through the engine and fills the oil filter (if equipped).
- Shut off the engine and wait a few minutes for the oil to settle.
- Check the oil level one final time and add oil if needed to reach the full mark.
- Inspect beneath the engine for any leaks around the drain plug or oil filter.
- Properly dispose of the old oil at a recycling center or auto parts store that accepts used oil.
Frequently Asked Questions
How often should I change the oil on my Craftsman lawn mower?
Most manufacturers recommend changing the oil every 50 hours of operation or at least once per mowing season, whichever comes first. New mowers may require an initial oil change after the first 5-10 hours to remove manufacturing debris.
Can I use car oil in my lawn mower?
While some automotive oils may be compatible, it is best to use oils specifically formulated for small engines. These oils contain additives that help protect against the higher operating temperatures and unique demands of lawn mower engines.
What happens if I overfill the oil?
Overfilling can cause excessive pressure in the crankcase, leading to oil leaks, foaming, and potential engine damage. If you accidentally overfill, drain the excess oil until the level reaches the full mark on the dipstick.
Do I need to change the oil filter every time I change the oil?
Not necessarily. Many manufacturers recommend changing the filter every other oil change. However, if the filter appears dirty or the engine has been under heavy use, replacing it each time is a good practice.
Can I dispose of old oil in the trash?
No. Used motor oil is considered hazardous waste and should never be disposed of in regular trash or poured on the ground. Take it to a local recycling center, auto parts store, or municipal waste facility that accepts used oil.
