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How to Rejuvenate Old Gasoline

March 18, 2024 | Victor Lukasso

Using old Gasoline stored in fuel tanks or cans for an extended period can cause damage to your engine, leaving you with no other option than to make sure that you Rejuvenate it before usage.

This doesn’t imply that Gasoline has a lifespan, but factors such as evaporation make it naturally degrade by losing some hydrocarbon bonds that contribute to its effectiveness.

Also, the Gasoline becomes darker and smells different from fresh fuel.

Gasoline kept in a sealed container under a 20°c temperature lasts up to 7 months, while Gasoline kept in closed tanks can only stay for six months before it degrades. However, fuels In unsealed tanks can only last for 90 days.


The best method to Rejuvenate Old Gasoline is mixing it with fresh Gasoline in a ratio of 1:4 while introducing an octane booster spray to the fuel tank to boost performance.

This article will show you the demerits of using Old Gasoline for your vehicle, how to recover or Rejuvenate oil Gasoline, and the best way to get rid of old Gasoline.

Continue reading…

The Disadvantage of Using Old Gasoline in Automobiles

You might think using Old Gasoline won’t affect your engine, but it does. It might not be instant damage, but you’ll see the effect(s) on your next car servicing.

Gasoline that has gone very bad might not even have the power to start your engine due to the absence of hydrogen-to-carbon bonds.

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1. Blockage of the Fuel System

Old Gasoline will block your fuel system (injector) due to white gums and silk-like substances, primarily because of evaporation.

2. Wear-out of Engine Components

Once Gasoline goes bad, the chemicals that boost your car’s performance will start eating and wearing out metal substances in your engine.

3. Results in engine failure

Due to the corrosiveness of the Gasoline, it will leave dirt deposits on your spark plug, causing engine misfiring or total failure.

4. The Engine will Require more Power to Run

Due to the ineffectiveness of the old fuel, the engine will require more power to continue working, which will cause excess smoke to come out of the engine.

How to Rejuvenate Old Gasoline

As stated earlier, the surest way to revive Old Gasoline is by mixing it in a ratio of 1:4 with fresh Gasoline before usage.

Let’s see a step-by-step guide on how to go about it.

  1. Get a new gallon to drain the old Gasoline into
  2. Drain the old Gasoline into the container using a hose or fuel pipe
  3. Add fresh Gasoline to your fuel tank
  4. Introduce octane booster into the Gasoline
  5. Use your car until the new Gasoline goes below ¼ of its original content
  6. Add some portion of the old Gasoline into the tank until you get a ¼ (quarter) tank full.
  7. Repeat the above process until you’ve finally exhausted the old Gasoline.
  8. Refill your tank with fresh Gasoline and fuel additive (octane booster) to maintain balance.
  9. You can now continue driving your car while admitting the octane booster at least two or three more times.

That’s it.

The main point is to use a high-octane gas and the old Gasoline in a 1:4 ratio, so if you’ve got 4 liters of fresh Gasoline, you should add 1 liter of old petrol.

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It would be best to forget the importance of fuel boosters, as they’ll help you maintain and boost fuel performance.

How to Keep Gasoline from Getting Old

If you’ve got Gasoline in large quantities, maybe for sale or personal use, you don’t need to worry about your fuel getting old.

Follow the below steps to preserve your Gasoline until it’s ready for use.

  1. Get a firmly closed container for your Gasoline
  2. Purchase and add a fuel stabilizer to help keep the fuel fresh.
  3. Pour an octane booster into it to enhance its performance.
  4. Please keep it in a ventilated environment of at least 20°c

That’s it.

You can now store your fuel for as long as you like.

However, there are some factors that you should put into consideration before rejuvenation old Gasoline.

⇒ One of them is the type of engine your car is running on; a fuel-injected vehicle might not function properly on a revived gasoline.

⇒ Another factor to consider is the fuel ratio to the cost of buying fuel additives and boosters.

If the fuel isn’t in a considerable amount, I’d advise you to use the money for octane boosters to get fresh Gasoline instead.

⇒ Also, some gasoline is ethanol-based, allowing them to trap water from the atmosphere; they will cause your engine to stall and malfunction even after rejuvenating them.

You can still revive this Gasoline instead of using it on your car; consider using it for household functions.

How to Dispose of Old Gasoline

Unlike hazardous batteries, Gasoline is toxic and could cause poisoning if not disposed of properly. So, if you don’t know what to do with old Gasoline, continue reading…

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Using Old Gasoline on your generators, car, and bikes harms those who inhale the smoke because it can cause damage to their lungs, cause nausea, and even death.

Here’s a way to properly Dispose of your old Gasoline or gasoline cans.

  • Transfer the old Gasoline from its container to a sealable can
  • Label the new can with “Toxic Waste” or “Hazardous waste.
  • Please take it to a nearby hazardous disposal institution
  • Now, rinse the former can with water and soap and leave it to dry
  • You can now recycle the old can.

That’s it.


Is 10-year-old gas still good?

No, any gas that has stayed unused for 365 days should be disposed of. Old gas will result in misfiring, blocked injectors, and wearing out of metal parts.

Can you fix the gas that has gone bad?

Yes, bad gas can be fixed by mixing it with fresh Gasoline in a ratio of 1:4 while introducing an octane booster to the fuel tank to boost performance.

Can I mix old Gasoline with new Gasoline?

Yes, but add fuel additives to the fuel content to enhance performance and prevent rough idling.

How can you tell if Gasoline has gone bad?

Gasoline going bad doesn’t necessarily mean that it’s old. A diluted fuel will also make it go not good.

Here are some things to watch out for that denote that Gasoline has gone bad.

  • Frequent Stalling
  • Rough Idling
  • Check engine light turns on
  • Misfiring
  • The engine refused to start
  • Gasoline has a sour smell
  • Gasoline becomes darker.

That’s it.

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Meet Victor Lukasso, the owner of V. Auto Basics. Through this blog, Victor Provides Insights on the latest tips, maintenance, repair, and techniques in the automotive world.