How to Change Oil in Your Generac Generator
Why Oil Changes Matter for Your Generator
Your Generac generator relies on clean oil to run smoothly. Over time, oil breaks down and collects dirt and debris. Regular oil changes help keep your generator working well and can extend its life.
Skipping oil changes can lead to engine damage, reduced performance, and costly repairs down the road. Think of an oil change as basic maintenance—like brushing your teeth to prevent problems later.
How Often Should You Change the Oil?
Most Generac generators need an oil change every 50 to 200 hours of use, depending on the model. Check your owner's manual for the exact schedule for your unit.
If you use your generator frequently or in dusty conditions, you may need to change the oil more often. Keep track of your running hours so you know when it's time.
What You'll Need
Before you start, gather these items:
- New oil (the correct type and amount for your model)
- An oil filter (if your generator has one)
- A wrench or socket set
- An oil drain pan
- Rags or paper towels
- A funnel
- Safety glasses
Your owner's manual will tell you which oil grade to use. Using the wrong oil can hurt your generator's performance.
Step-by-Step Oil Change Process
Step 1: Prepare Your Generator
Turn off your generator and let it cool for a few minutes. A warm engine drains better than a cold one, but a hot engine can burn you. Work in a well-lit, flat area with good ventilation.
Step 2: Locate the Oil Drain Plug
Find the oil drain plug on the bottom or side of your generator's engine. Place your drain pan underneath it to catch the old oil.
Step 3: Drain the Old Oil
Use your wrench to loosen the drain plug by turning it counterclockwise. Once it's loose enough, carefully unscrew it by hand. Let the old oil drain completely into the pan—this may take several minutes.
Step 4: Replace the Oil Filter (If Applicable)
If your Generac has an oil filter, locate it and use a filter wrench to remove it. Wipe the filter mounting surface clean with a rag. Apply a thin layer of new oil to the rubber gasket on the new filter, then screw it on until it's snug. Don't over-tighten it.
Step 5: Install a New Drain Plug (If Needed)
Some generators have disposable drain plugs. If yours does, install a new one. If it's reusable, wipe it clean and reinstall it, tightening it securely but not excessively.
Step 6: Add New Oil
Place a funnel in the oil fill opening. Slowly pour in the recommended amount of new oil. Check your manual for the exact quantity. Don't overfill—too much oil can damage your engine.
Step 7: Check the Oil Level
Wait a minute for the oil to settle. Use the dipstick or sight glass to check the level. It should be at the "full" mark. Add a bit more if needed.
Step 8: Run and Inspect
Start your generator and let it run for a minute or two. Turn it off and wait a few minutes, then check the oil level again. Look under the drain plug area for any leaks.
Disposing of Old Oil Safely
Never pour old oil down the drain or into the ground. Oil is harmful to the environment and often illegal to dispose of improperly.
Take your used oil to:
- A local recycling center
- An auto parts store (many accept it for free)
- A service station or mechanic
- Your city's hazardous waste collection event
Many places will accept oil for free, and some may even pay for large quantities.
Common Mistakes to Avoid
Using the wrong oil type: Always follow your manual. The wrong oil can reduce performance and void your warranty.
Overfilling the oil: Too much oil can cause leaks and engine problems. Fill to the recommended level only.
Not letting the engine cool: Hot oil can burn you. Wait a few minutes after running the generator before draining.
Forgetting to replace the drain plug: Double-check that the drain plug is tight before running your generator.
Skipping the oil filter: If your generator has a filter, replace it every time you change the oil for best results.
When to Call a Professional
If you're uncomfortable working on your generator, or if something seems off during the process, it's okay to take it to a service center. A professional can handle the oil change and check for other issues at the same time.
You should also seek professional help if you notice leaks, unusual noises, or difficulty starting after an oil change.
Keep Your Generator in Top Shape
Regular oil changes are one of the easiest ways to keep your Generac generator running reliably. By following this guide and sticking to your maintenance schedule, you can help ensure your generator is ready when you need it most.