How to Change the Oil in Your Bolens Lawn Mower

Why Regular Oil Changes Matter

Oil keeps your Bolens mower's engine running smoothly and efficiently. Over time, oil gets dirty, breaks down, and loses its ability to protect engine parts. Changing it regularly helps your mower last longer, run better, and start more easily. Regular oil changes are one of the simplest things you can do to maintain your equipment and avoid costly repairs down the road.

When oil becomes old and contaminated, it can't do its job of lubricating moving parts inside the engine. This causes extra wear and tear on components like pistons, cylinders, and bearings. Fresh oil also helps keep your engine cooler and removes harmful buildup that forms during normal operation. By staying on top of oil changes, you're investing in the long-term health of your mower.

What You'll Need

Before you start, gather all the items you'll need. Having everything ready makes the job go faster and smoother. Here's what to collect:

• New oil (check your mower's manual for the right type and amount—usually SAE 30 or 10W-30)
• An oil drain pan (to catch old oil)
• A wrench or socket set
• An oil filter wrench (if your model has a filter)
• A new oil filter (if your model uses one)
• Rags or paper towels
• A funnel (to pour oil without spilling)
• Work gloves (optional, but helpful)
• A clean workspace or flat surface

Most of these items are inexpensive and worth keeping in your garage or shed. If you're unsure about the oil type or filter for your specific Bolens model, check the owner's manual or look at the information label on the mower itself. Having the right supplies prevents mistakes and makes the job easier.

Step 1: Prepare Your Mower

Safety comes first when working on any piece of equipment. Let your mower cool down for at least five to ten minutes if you've been using it recently. Hot oil can cause serious burns, so never rush this step. You want the engine to be warm enough that the oil flows easily, but cool enough to touch safely.

Make sure your mower is parked on flat, level ground where you have plenty of room to work. Turn off the engine and disconnect the spark plug wire from the spark plug—this prevents accidental starting while you're working. If your mower has a fuel shutoff valve, turn it off as well. This simple preparation takes just a minute but keeps you safe throughout the entire process.

Step 2: Drain the Old Oil

Locate the drain plug underneath your mower's engine. It's usually a bolt or plug at the lowest point of the engine. Place your drain pan directly underneath it to catch the oil. Use your wrench to loosen the drain plug by turning it counterclockwise. Once it's loose enough, you can usually unscrew it by hand—just be careful if it's still warm.

Let the old oil drain completely into the pan. This may take five to ten minutes, so be patient. While you're waiting, you can wipe down the area around the drain plug with a rag to remove any dirt or debris. Once the oil stops dripping, wipe the drain plug clean and set it aside. Don't lose it—you'll need to put it back in.

Step 3: Replace the Oil Filter (If Applicable)

Not all Bolens mower models have an oil filter, so check your manual first. If your mower does have one, you'll find it mounted on the side of the engine. Use your oil filter wrench to grip the filter and turn it counterclockwise. It should come off after a few turns. Be prepared for a small amount of oil to spill out—that's normal.

Once the old filter is off, take a rag and wipe the filter mounting surface clean. This removes any dirt and old oil residue. Take your new oil filter and apply a thin layer of new oil to the rubber gasket on top. This helps create a good seal. Screw the new filter on by hand until the gasket contacts the mounting surface, then turn it an additional three-quarters of a turn. Don't over-tighten it—hand-tight is correct.

Step 4: Add New Oil

Before adding new oil, wipe off the drain plug with a clean rag and screw it back into the engine. Tighten it firmly but don't over-tighten, as this can strip the threads. Once the drain plug is secure, place your funnel in the oil fill opening on top of the engine. The oil fill cap usually has an oil can symbol on it.

Slowly pour the new oil into the funnel. Check your Bolens manual for the exact amount your specific model needs—this is important because overfilling can damage your engine. Most small mowers use between one and two quarts of oil. Pour slowly and carefully to avoid spills. If you do spill some oil, wipe it up with a rag right away.

Step 5: Check the Oil Level

After you've added the oil, replace the oil fill cap and wait about one minute for the oil to settle. Then remove the dipstick—this is a thin metal rod that measures oil level. Wipe it clean with a rag and reinsert it all the way. Pull it out again and look at where the oil reaches on the stick.

The oil should reach the "full" mark on the dipstick. If it's below the mark, add a little more oil and check again. If you accidentally overfilled, you can remove some oil with a small syringe or turkey baster. Getting the level right is important—too little oil means poor lubrication, and too much can cause engine damage. Take your time with this step to get it just right.

Step 6: Dispose of Old Oil Properly

Never pour old oil down the drain, into the ground, or into the trash. Used oil is an environmental hazard and is illegal to dispose of improperly in most places. The good news is that recycling used oil is easy and often free.

Take your drain pan of used oil to a local recycling center, auto parts store, or service station. Most of these places accept used oil at no charge and handle it responsibly. Some stores even offer small discounts on new oil if you bring in your old oil. Call ahead if you're unsure whether a particular location accepts used oil. Responsible disposal takes just a few extra minutes and protects the environment.

When to Change Your Oil

Check your Bolens owner's manual for the recommended oil change interval for your specific model. Most residential lawn mowers need an oil change every 50 hours of use or once per season, whichever comes first. Some newer models may have longer intervals, while older models might need more frequent changes.

Keep track of your mower's hours by writing them down each time you use it, or note the date of each oil change. If you use your mower heavily during the growing season, you might need to change the oil more often. At minimum, change the oil at the beginning of each mowing season before you start regular use. This ensures your mower runs at its best all season long.

Key Takeaways

• Regular oil changes keep your Bolens mower's engine healthy and extend its lifespan
• Gather all necessary tools and supplies before you start the job
• Always let your mower cool before working on it to avoid burns
• Drain old oil completely, replace the filter if your model has one, and add the correct amount of new oil
• Check the oil level with the dipstick to ensure it's at the full mark
• Recycle old oil at a local recycling center, auto parts store, or service station
• Follow your manual's recommended oil change schedule for best results

Frequently Asked Questions

What type of oil should I use in my Bolens mower?

Most Bolens lawn mowers use SAE 30 oil for warmer months or 10W-30 for year-round use. The exact type depends on your specific model and your climate. Check your owner's manual for the manufacturer's recommendation. Using the wrong oil type can affect engine performance and durability. When in doubt, ask at an auto parts store or contact Bolens customer service with your mower's model number.

How often should I change the oil in my Bolens mower?

Most Bolens mowers need an oil change every 50 hours of use or once per season, whichever comes first. If you use your mower frequently or in dusty conditions, you might need to change it more often. Always check your owner's manual for your specific model's recommendations. Keeping a log of your oil changes helps you stay on schedule and remember when the next change is due.

Can I change the oil myself, or do I need to take my mower to a shop?

You can definitely change the oil yourself if you follow the steps carefully and have the right tools. It's a straightforward task that takes about 30 minutes once you get the hang of it. Many mower owners prefer to do it themselves to save money and stay familiar with their equipment. However, if you're uncomfortable working on machinery or don't have the necessary tools, a local repair shop can do it for you.

What should I do if I accidentally overfill the oil?

If you add too much oil, remove the excess before running the mower. Use a small syringe, turkey baster, or oil extractor to pull out the extra oil until the dipstick shows the correct level. Overfilled engines can experience poor performance, increased smoke, and potential damage. It's better to add oil gradually and check frequently than to overfill and have to remove it.