How to Get Rid of Old Gasoline Mixed With Oil

Gasoline and oil don’t usually mix, but it can be a problem when the two substances do. It’s essential to dispose of old gasoline mixed with oil immediately because if left alone in an enclosed space, there is a risk for an explosion. The following will provide you with information on how to get rid of old gasoline mixed with oil safely and quickly. 

How to Get Rid of Old Gasoline Mixed With Oil

Nothing is more frustrating than discovering that your old gas has mixed with oil. This is an expensive and time-consuming problem to deal with, but luckily there are a few solutions. You can pour the gasoline on some dirt and let it evaporate naturally, or you can use a commercial product like Fuel Evac to remove the oil from your tank. Keep reading for more information about how you might be able to get rid of this unpleasant mixture!

10 Ways on How to Get Rid of Old Gasoline Mixed With Oil

1. Dilute it with Fresh Gas and Reuse

This is a way to get rid of old gasoline that is mixed with oil. You just need to mix 1 part fresh gasoline with 3 parts of the old gasoline/oil mixture. This will also help clean your gas tank in the process.

2. Let It Evaporate

This is a slow but effective method to get rid of old gasoline mixed with oil. It will take a few days or even weeks, but you can be sure that it is completely gone after using this method for your car tank. Leave the old gas/oil mixture in the gas tank for some time, and eventually, it will evaporate. You can also help the process by adding some fresh gasoline to the gas tank and driving your car for a few miles.

3. Make an Absorbent

Another way to get rid of old gasoline mixed with oil is by using an absorbent. This can be anything from kitty litter to sawdust. Just pour the absorbent material over the gas/oil mixture and let it sit for a while. The absorbent will soak up all the liquid and dispose of it. This involves adding a small amount of fresh gasoline to the mixture and then allowing it to sit for a while.

4. Dispose of It Properly

Dispose of the Old Gasoline

If you don’t want to use any of the methods mentioned above, you can always dispose of the old gasoline mixed with oil properly. All you need is a container and some patience. Pour the mixture into the container and let it sit for a day or two. Once the gasoline has evaporated, you will have a layer of oil at the bottom. You can then lift it off and dispose of it properly.

5. Dispose Of It With a Vacuum

If your car tank is full, another method to get rid of old gasoline mixed with oil is to use a vacuum cleaner. Attach the vacuum cleaner to the car tank’s opening and turn it on. The suction will pull the old gasoline/oil mixture out of the tank and into the vacuum cleaner. Empty the vacuum cleaner’s canister in an approved disposal container. If you have a lot of old gasoline/oil mixture, you may need to empty the vacuum cleaner several times.

6. Submit it to Waste Management Company

If your car has a small amount of old gasoline mixed with oil in it, you can try attaching the negative pole of the battery to the fluid and cranking the car. This might not work very well for a lot of mixture, but it could help remove a little bit.

Note: Never dispose of old gasoline/oil mixture in the gutter, sewers, or other areas where it can harm humans or animals.

7. Let It Drain into Soil

If your car tank is almost empty, you can also try to get rid of old gasoline mixed with oil by draining it into the soil. Unscrew the gas cap and let the mixture flow out. Be sure to do this in an area where there is no danger of harming humans or animals.

8. Salvaging Old Gas Oil Mix

Use Separator to Separate Gasoline From Oil

If you have an old gas/oil mixture and want to salvage it, there are a few ways to do this. One way is by using a separator. This is a device that will help to separate gasoline from oil. You can then use the gas for your car and dispose of the oil safely.

9. Boil It Out

Yet another way to get rid of old gasoline/oil mixture is by boiling it out in a pot on your stove. You can then dispose of the used oil and keep the gasoline for future use in your car. However, this method is not very effective with large quantities of old gas/oil mixture.

10. Use a Garden Hose

If you don’t have a vacuum cleaner, you can always use a garden hose to remove the gasoline/oil mixture. Just attach a hose to your car’s tailpipe and open it up. The gasoline/oil mixture will flow out on its own into the garden, where you can then safely dispose of it.

How to Dispose of Gasoline-Oil Mixes in Your Regular Trash

If your gasoline-oil mix is only a small amount, you may be able to dispose of it in your regular trash. However, you’ll need to take the following steps to do it safely:

1. Pour the gasoline-oil mix into an empty can with a lid.

2. Mix in kitty litter or coffee grounds (the larger the chunks, the better), until they cover all of the liquid on top and fill about one-quarter of the can.

3. Pour two-thirds of the oil/gas mixture from the can into a sealable plastic bag, then seal it and put it in another sealable plastic bag.

4. Pour the kitty litter and gasoline-oil mix from the can into another sealable plastic bag.

5. Keep all of the bags sealed and take them to your local solid waste facility or household hazardous waste collection center.

6. If you don’t need the kitty litter anymore, give it to your local animal shelter or veterinarian for use as bedding.

Some Tips and Suggestions

1. First, you must detach the gas tank from the mower making sure it has enough room to hold all the components and remaining oil.

Detach the Gas Tank From the Mower

2. Make sure that the mower is on a flat and leveled surface, and make sure it won’t move while draining.

3. Position small containers under the petcock of the mower, unscrew the petcock, and allow oil to drain into the containers.

4. Once the oil has drained, reconnect the gas tank and start the engine for a few seconds so that any remaining gasoline will be forced out of the carburetor and fuel lines.

5. Shut off the engine and let it cool completely before removing the gas tank again.

6. Clean the gas tank with soap and water. Make sure there are no traces of oil in it; if there are, wipe them out carefully with a paper towel soaked in gasoline. This way, you can remove any stubborn stains.

Why Dispose off the Mix Properly?

Gasoline and oil don’t mix well. When the two substances are combined, they tend to form a sludge that’s difficult to clean up. Not only is this a mess, but it’s also a safety hazard. If you store or dispose of gasoline-oil mixes improperly, you could end up with a dangerous fire or chemical spill.

Fortunately, there are several ways to get rid of old gasoline mixed with oil. Depending on your situation, you may be able to discard the mixture in your regular trash, pour it down the drain, or take it to a hazardous waste disposal site.

How to Tell if Gasoline Is Old?

If you’re not sure if the gasoline in your tank is old, there are a few things you can do to test it. One way is to pour a small amount of it into a clear glass jar and let it sit for 24 hours. If the gasoline has separated from the oil, the two will be at different levels in the jar. In addition, you can take a long piece of white paper and fold it in half twice. Finally, drip about one teaspoon of gasoline onto the paper, making sure not to soak it thoroughly.

Test Old Gasoline in a Jar

Let this sit for a minute or two, then unfold the paper. If your gasoline is old, oil spots will appear on the paper rather than droplets of pure gasoline. Another way to determine if the fuel in your tank is bad is to put a little into an empty can or jar. If it causes the liquid to foam or froth, this means that there’s water in the gasoline, and you should never use it because it will damage your engine beyond repair.


The use of gasoline has increased dramatically over the last few decades. However, this increase in gas consumption is also leading to an accumulation of old gasoline mixed with oil that takes up space and needs to be disposed of properly. While any of these methods should help get rid of old gasoline mixed with oil from your car, it’s essential that you choose the suitable method and don’t do anything too dangerous.

We hope this blog post on how to get rid of old gasoline mixed with oil has been helpful. If you have any additional advice to offer fellow readers, please leave a comment below so we can all get rid of this old gas/oil mixture most safely and effectively possible! Also, if you enjoyed this article or found it helpful, please share it with your friends!

Jennifer Branett
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