How to Change the Oil in a Push Mower (Step-by-Step Guide)

Regular oil changes are one of the easiest and most important ways to extend the life of your push mower. Clean oil keeps the engine lubricated, reduces wear, improves performance, and prevents overheating. The good news? Changing the oil in a typical walk-behind mower only takes about 20–30 minutes.

Whether you own a model powered by a Briggs & Stratton, Honda, or Toro engine, the basic process is very similar.

Why Changing Your Mower Oil Matters

Over time, engine oil becomes contaminated with:

• Dirt and grass debris

• Metal particles

• Fuel residue

Dirty oil loses its ability to lubricate properly, which can cause engine damage. Most manufacturers recommend changing mower oil:

• After the first 5 hours (for a new mower)

• Every 25–50 hours of use, or

• At least once per mowing season

Always check your owner’s manual for exact recommendations.

What You’ll Need

Before you begin, gather:

• Fresh engine oil (usually SAE 30 or 10W-30 — check your manual)

• Oil drain pan or shallow container

• Funnel

• Clean rag or paper towels

• Socket wrench (if your mower has a drain plug)

• Gloves (optional but recommended)

Step-by-Step: How to Change the Oil

Step 1: Warm Up the Engine

Run the mower for 2–3 minutes. Warm oil flows more easily and drains more completely.

Turn off the mower and disconnect the spark plug wire for safety.

Step 2: Position the Mower

Place the mower on a flat surface. If your mower does not have a drain plug, you will tilt it to drain the oil through the fill tube.

Important: Tilt the mower with the air filter and carburetor facing upward to prevent fuel from leaking into the filter.

Step 3: Drain the Old Oil

There are two common methods:

Option A: Using a Drain Plug (if equipped)

• Place your drain pan under the plug.

• Remove the plug using a wrench.

• Let the oil fully drain (this may take several minutes).

• Replace and tighten the plug securely.

Option B: Tilting the Mower

• Remove the oil cap/dipstick.

• Carefully tilt the mower with the carburetor side /air filter housing facing upwards to prevent spilling fuel.

• Allow the oil to drain into your container.

Step 4: Add New Oil

• Set the mower back on a level surface.

• Insert a funnel into the fill tube.

• Slowly add the recommended amount of oil (usually 16–20 oz / or 2 cups for most push mowers). Always check your specific mowers oil capacity first.

• Check the dipstick to avoid overfilling.

Do not overfill — too much oil can damage the engine.

Step 5: Reconnect and Test

• Reattach the spark plug wire.

• Start the mower and let it run for about 30 seconds.

• Shut it off and recheck the oil level.

• Add more if necessary.

How to Dispose of Used Oil

Never dump used oil in the trash or on the ground. Take it to:

• An auto parts store

• A local recycling center

• A hazardous waste facility

Most places accept small engine oil for free.

Pro Tips for Longer Engine Life

• Check oil level before each mowing session.

• Change oil at the beginning of every season.

• Replace or clean the air filter regularly.

• Use fresh fuel to prevent engine deposits.