How to Change Generator Oil?

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A simple way to ensure your generator runs for as long as possible is to change the oil regularly. We have written this article to help those of you who are unaware of how to change generator oil. You must consider two factors when changing your generator oil.

Identifying the brand of your generator is the first step. Compared to other brands of generators, Honda generators generally require different requirements for maintenance. To maintain your generator, you must know the location of your oil check and its model.

Change Generator Oil

Additionally, you need to take your generator’s frequency of use into consideration when changing its oil. Whatever your generator’s role is, whether it runs continuously or occasionally. Changing the old oil with new oil in your generator will allow the essential parts of the engine to operate properly. This article includes instructions on when to change the oil and how to do it.

If you follow our detailed instructions, you can change the oil and oil filter on the majority of generators. Please leave the oil replacement to professionals if you cannot understand any point in this guide.

How Often Should The Oil Be Changed and What To Check For?

Changing the oil on your generator is a good idea if you just purchased it, regardless of its make or model. It is highly possible that the manufacturer forgot to add oil to the generator.

After your generator has run for a while, it is imperative that you turn it off and let the engine cool down. Ideally, you should see the oil settle within two minutes. Using the dipstick on the back of the engine, check the oil.

If you’re checking the oil, you should clean it with cloth beforehand. The dipstick must be placed inside the dipstick tube and then removed to be seen. Once it is removed, you can determine whether you need to change the oil.

Maintaining your generator on a regular basis will make the process much easier. An expert recommends changing the oil in a generator every 50 to 200 hours.

The answer is obviously subjective because it is determined by factors such as whether the generator is new, which brand it is, and where it is located. You may need to maintain your generator regularly if you live in an environment prone to dust or contaminants. As a result, you will need to change the oil more frequently because it mixes with the oil.

How to Change Generator Oil?

Make sure your safety is taken into account before changing the generator’s oil or oil filter. You may want to wear goggles and gloves while doing this. Furthermore, make sure you have everything you need with you.

Step 1. Warming Up Old Oil

It’s easier to drain out old oil if it’s warmed up inside the engine before you drain it. Hot oil will flow through the pipeline more easily.

If you start your generator and let it run, you can accomplish this in just a few minutes. Upon getting the old oil warm enough, you can turn off the generator.

Step 2. Lift and Place Generator on Blocks

Then, on a level surface, place as few identical blocks as possible. The more sturdy the table, the less strain on our backs.

You will have space under your oil drain plug if you mount your generator on blocks.

Step 3. Disconnect the spark plug

When you place your machine on stable blocks, you must locate and unplug the spark plug. A non-oiled engine won’t start accidentally if this step is taken.

Spark plugs can be found readily on most makes and models of engines, but sometimes they are hidden by plastic covers. Have trouble finding your spark plug? Check your manufacturer’s manual.

We might be able to locate it easier if it indicates where it is hiding. In addition, some models and brands use multiple spark plugs.

Please read your generator’s instructions before using it.

You need to remove the spark plug wire after you have determined where it is located. The safest way to remove spark wire boots is to grasp both ends firmly and simultaneously twist and pull them.

You can still break the spark plug wire loose this way (and safely) even if the wire is slightly corroded.

The rotational motion also helps in unclipping the connections from the spark plug in addition to easing the strain on the wire. However, be careful not to damage the wire by pulling on it too hard. Don’t let the wire come in contact with the spark plug while you’re changing the oil. Be sure that it is secured safely.

Step 4. Get ready for draining the old oil

Locate the oil drain plug after you have disconnected the spark wire. Most nuts have a square or hexagonal head and are 3/8″ in diameter. The size and shape of this particular nut will differ depending on the type and brand of generator, so you will need to consult your owner’s manual.

It is critical that you wipe off any oil residue and grime from the parts surrounding the drain plug if they are dirty. This is in order to be able to see what is going on. Under the generator’s drain plug, you should place an oil pan to catch oil leaks.

Step 5. Take out the oil plug

The oil drain plug needs to be removed after the drain pan is placed so that oil can be gathered. Ratchets and 3/8″ sockets are the most commonly used tools.

Use a ratchet solely to loosen the plug.

Once the ratchet is released, the socket and ratchet must be removed manually. When you remove the plug, the old oil will be drained from the engine. Be aware of this!

Make sure your drain pan is completely drained. There is a danger of contaminating soil and water if you dispose of this in the trash. It would be best to recycle it instead.

Step 6. Replacing the old oil filter

Replace your generator’s oil filter as well. To save money, people drain their old oil and do not replace their oil filters. However, running new oil through a dirty filter isn’t recommended.

In order to prevent your generator engine from malfunctioning, you should change the oil and filter together every once in a while. You will need an oil filter wrench for this.

Remove the old filter gently with the wrench while holding the filter at the bottom.

Once the wrench is removed, remove the remaining screws. When handling oil filters, it is imperative to wear protective gloves since they can become quite hot.

A drain pan should also be placed under the filter because oil may come out of the opening or the filter.

Remove any debris or gasket material from the sealing surface of the oil filter adapter if necessary. The gasket of your new filter should be lightly coated with engine oil. Once the gasket contacts the filter adapter, screw it into place by hand.

Using your wrench or pliers, tighten the filter another 1/2 to 3/4 turn. It is not a smart idea to overtighten your filter. To dispose of used oil and oil filters, visit your local auto parts store or service station.

Step 7. Put new oil in and tighten plug

During installation of the new filter, the oil drain plug must be installed again. When it has been screwed in manually, use a socket wrench to tighten it again. Once the oil fill cap has been removed, a funnel will need to be inserted.

Oil should now be slowly poured into the generator.

For information about how much oil to pour into your engine, read the official owner’s manual that came with it. Furthermore, based on the temperature and climate in the region where you intend to use the generator, you may have to use different oils.

After the oil is poured in, the funnel needs to be removed, and the oil cap needs to be closed.

Step 8. Reconnect Spark Plug Wire

As a final step, connect the spark plug wire. Slide the boot of the wire over the top of the plug again while holding the wire. The boot must be fully inserted into the plug.

In most cases, you can hear or feel a click if the connector is in the right position. After you’ve repaired the plug, reattach the covers you removed to access the plug.

Let the engine lubricate for a few minutes after the oil circulates through it after the generator has started. Turn the generator off and check the oil level after it has run for a few minutes. The above steps should be followed until you reach the required oil level in this case. In order to ensure that the generator is a reliable companion during hurricane season, it needs to have its oil and oil filter changed.


A professional can change the oil in your generator, but it is not necessary. The steps below will help you do the job yourself. Make sure your generator oil is regularly checked.

Perform routine maintenance on your generator if you want it to run smoothly. It needs to be well maintained if you want to avoid disappointment when you use it.

Because you’ll be changing the oil frequently, you’ll need to learn how to change generator oil.

If you follow the information provided in this article, you should find it quite simple to replace your generator oil.

MyGeneratorLab was founded and is headed by Kaif Rai. As a long-time outdoorsman, I've always been fascinated by generators. I founded MyGeneratorLab to share my knowledge of the best generators on the market with others. I provide reviews on generators with in-depth guides. I will help you learn how to maintain generators properly so they will last longer by using my guides! I started my generator reviews in 2021. Since then, I’ve had the privilege of experiencing and testing generators of all shapes and sizes.

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