Home Fuel System Best Fuel Additive – Which One Is The Best For Your Engine?

Best Fuel Additive – Which One Is The Best For Your Engine?

by Kelvin Yates

Are you getting tired of our car performing really poorly and you are looking for the best fuel additive out there to help you regain some of the performance and make your car work as it should? If that is the case, then you are at the right place because there will be a lot to cover on this topic.

Using an additive in some situations can be a really good idea. Especially if we are talking about old cars that have a ton of miles on them. This special additive will give you the performance that your car needs in order for you to resume doing your daily activities and drive your car as it should be driven.

It is worth noting that there are a ton of different types of fuel additives that are doing different purposes. Some are designed for cleaning the fuel system while others are designed for improving the octane ratings of the fuel and improving its combustion. So, you need to be aware of these things. This is why we are going to cover everything in detail so you get the best information.

First, we are going to learn what is a fuel additive and the different types of additives that are out there. Knowing the types will help you determine what additive you should get for your car. Then we will cover the benefits of these additives and if should you get one for your vehicle.

Later on, we will cover the best fuel additive in certain categories so you get a good perspective of what to buy. So, if you want to learn more about the best fuel additive, follow along.

What Is A Fuel Additive?

Now before we dive into the types of fuel additives and the best fuel additive, let’s first learn more about the fuel additive in general and learn more about the basics. This chapter will be a good starting point for you before you try to understand more about the different types of these additives and what they do. So, let’s get into it.

A fuel additive is a special chemical solution that is used to improve the engine’s performance. As you probably are aware. Engines and cars get old and start to perform quite poorly.

There are many different systems that are affected by this type of wear and tear. The fuel tank, fuel lines, injectors, and even the combustion process will be much worse on a worn-out engine.

This is why there are some solutions known as fuel additives to improve the performance of the engine and make it perform slightly better than normal.

When you pour a fuel additive, you will notice an improvement in performance. And let me tell you a secret. Some car sellers are pouring this additive into their cars for sale to make them perform better. And after the additive starts to disappear, you will see its downsides.

But what are the types of fuel additives that are available out there? Knowing this will be extra useful for you to know before we learn more about the best fuel additive out there.

Types Of Fuel Additives?

Now in the following chapters, let’s elaborate more on the types of fuel additives. Knowing the types will help you learn what you really need.

Since not all additives are doing the same type of work and have different purposes based on the problem that you are dealing with. So, let’s cover them really quick before we dive into the best fuel additive topic and learn which ones are the best in certain categories.

1. Fuel Conditioner

The first type of best fuel additive that we are going to cover is the fuel conditioner type or fuel treatment as some people call them. Fuel conditioners are the most popular additives and also one of the cheapest additives out there that you can purchase.

As their name implies, they are fuel conditioners. Which means that they help your vehicle perform better. They are formulated to work on diesel and gas engines. But still, you need to learn the description and check if this solution works on both types of engines. Just to be sure.

These types of conditioners are used by a ton of owners to pass smog tests. They neutralize carbon deposits and bring cleaner emissions. Thus, helping you to pass the emissions testing. So, if you have a car with a bad catalytic converter. This type of best fuel additive is perfect for you.

2. Fuel Stabilizer

The second type of best fuel additive that we would like to cover is the fuel stabilizer. The fuel stabilizer is a specially formulated type of additive that has the sole goal of preserving the fuel inside of the gas tank.

This type of additive is perfect for cars that are not driven a lot. So, if you have a classic motor that you don’t drive too much and you want your gasoline to stay fresh in the long run, using this type of additive might be the best solution for you.

Some of these additives are promising a lot. Up to two years of the freshness of the gasoline in your tank. And considering that gasoline only lasts up to six months on average, then this best fuel additive will be perfect for you.

So, if you have a classic motor or a car for storage, you should go for this type of additive for your car without a doubt.

3. Octane Booster

The next type of best fuel additive that we would like to cover is the octane booster. The octane booster as its name implies is a special additive that serves the purpose of boosting the octane rating of your car.

This additive is especially good if you are running a high compression engine like a race car for example. Gas pump octane ratings are pretty low and you need something for the track that will give you that extra edge and squeeze every last bit of performance from your engine.

And this is why octane boosters are perfect for this. These octane boosters come in small cans of 6.7 oz which is good enough for a full tank of gasoline.

They also promise that they will clean the engine from carbon deposits and other debris that usually collects on the valves and injectors. But still, their prime task is to boost the octanes as well as the performance of your vehicle. Now let’s move to the next type of best fuel additive.

4. Fuel Injector Cleaner

The next type of best fuel additive is the fuel injector cleaner. The fuel injector cleaner is one of the most common types of additives that are used on cars.

This is the case because a ton of people are having problems with their fuel injectors. Especially cars with a ton of miles that have a ton of gunk accumulated on them.

Best Fuel Additive

When there are obstructions on these injectors, the flow of fuel will be quite poor and the car will simply fail to deliver. This is why using a solution like this can save your life. I mean literally.

A ton of owners report significant changes after using solutions such as Seafoam that clean the injectors and also improve the combustion. So, if your car underdelivers, this type of best fuel additive might be really good for you to avoid dealing with a problematic vehicle.

5. Catalytic Converter Cleaner

And the last type of best fuel additive is the catalytic converter cleaner. Believe it or not, there are also solutions that promise to clean your catalytic converter as well.

You just pour them into the gas tank and they will work to eliminate the debris that clogged up inside of the catalytic converter.

Even though their effectiveness is doubtful. Still, it is a good idea to try them out if you have problems with a clogged converter. If the problem is just starting, you might solve the issue quickly. If not, you will have to replace the converter. Simple as that. Now let’s cover more about the benefits of these solutions in the next chapter.

Benefits From Using A Fuel Additives

Now before we dive into the best diesel fuel additive (once you’ve figured out why is diesel so expensive) and learn all the best additives that are out there in certain categories. Let’s first learn more about the benefits of using additives. What can you expect from these additives in the first place? Will your life change after you start using them?

Well, they will help your car. That’s for sure. Some of them will work better than others with your specific engine and this is why you should not disappoint yourself if the additive that you purchased isn’t working well. Just try a different solution and you will see the benefits right away.

Also, these additives will save you a ton of money on engine cleaning if the engine is old and has a ton of carbon deposits. Some of the additives such as Seafoam as we mentioned are all in one, they will increase the power, improve the lubrication and the engine will live its second life.

The benefits of these solutions for older cars are enormous and you should never be afraid of using an additive if your car is older than 15 years or so.

Not to mention that these solutions are not only for your wallet but also for the environment. Your car will highly likely pollute less when using this type of additive and you will pass the inspection without any hiccups.

But using this best diesel fuel additive is not recommended always. And in the next chapters, we are going to learn when you should use it on your car if you want not to harm your engine.

When You Should Use An Fuel Additive?

So, when you should use the best fuel additive in your car? Well, this greatly depends on the specific purpose.

For example, using additives on newer and low mileage cars really makes no sense at all. Since these cars have good engines that are not worn out. So, the benefits of using an additive on a car like this will be minimal or almost inexistent.

Additives should be used in older vehicles that are nearing their end of service and this will be a way to extend their life for a little bit longer and squeeze every mile out of them.

So, if you have an older car that has trouble passing the inspections, then this solution will be the way to go. Another example is a car with fuel injectors that do not work as they should and the car jerks and hesitates because of the poor performance of the fuel system. In this case, using the additive will give this system a good cleaning and the car should work well again.

Also, if you have a car that is intended for long-term storage. Then using the best fuel additive to extend the life of the fuel in the gas tank might be an excellent idea.

And lastly, the octane boosters should be used if you are using your car for the track and you cannot squeeze the most performance from your engine on those long track days with regular gas. So, an octane boost might be the way to go. But what is the best diesel fuel additive? Let’s see more on that next.

Best Fuel Additive

Now as we covered the basics of car additives and the types of additives that are out there. Let’s now focus more on the best fuel additive.

Which additive is the best for a certain category of vehicles out there? Knowing this will make your purchasing much easier since you will be able to tell which additive you need for your car. So, let’s cover these categories in the following chapters.

Best Diesel Fuel Additive

The first category of best fuel additive that we are going to cover is the best diesel fuel additive for winter. And the best product in this category is an easy win for the Hot Shot’s Secret Everyday Diesel Treatment.

This is one of the best sellers on Amazon when it comes to diesel engines. It treats several symptoms such as poor MPG, loss of power, loss of power in cold weather, and poor fuel combustion.

1 gallon of this solution will be good for 3.200 gallons of diesel. And the feedback for this product tells everything with almost impeccable ratings. It will work perfectly on Cummins, Powerstroke, and Duramax engines.

Best Fuel Additive For Carbureted Engines

When it comes to the best fuel additive for carburetted engines, Seafoam is always the way to go. We all know Seafoam and its really good products.

Their SF-16 Motor treatment will work on any car. No matter if it’s a fuel-injected or carburetted vehicle. It will clean your carburetor or injectors like nothing else out there. As it says in the description, it will liquefy the gum and the deposits on the carburetor and will clean it really nicely.

And also, it is dead easy to use, you just pour this solution into your fuel tank and follow the instructions on the product label. If you follow the instructions carefully, this product will work in 99% of the cases.

Not to mention that it is really cheap. So, you won’t lose anything for trying it. Also, this product has some impeccable ratings and you should read some of the experiences from buyers in order to get the most out of the product.

Best Fuel Additive For Old Gas

When it comes to storing a car for the winter and keeping the gas in the car in check, the best product out there probably is the STA-BIL Storage Fuel Stabilizer.

This solution will keep your gasoline fresh for up to two years. With this solution, you will never have to worry about how old the gas in your car is.

The smallest package is 8 oz and this will be good to treat up to 20 gallons of gasoline. Which is really good. This solution not only works well with gasoline but also with all the ethanol blend fuels that are out there. Also, the ratings tell everything about this product and its good performance.

Best Fuel Additive To Clean Injectors

When it comes to cleaning fuel injectors there is another great product by Seafoam and that is the Sea Foam ICT Fuel Injector Cleaner.

This injector cleaner promises a lot. And that is to help clean the fuel injectors and also to restore the injector spray patterns. Bringing the injectors back to factory OEM spec.

It will also help the lubricity in the cylinders and will recover the lost MPG as well as reduce the emissions from the exhaust.

This small bottle of 5.25 oz can treat up to 25 gallons of gasoline. And also it is really cheap. Costs only $4.5. You can’t beat that in my opinion. And the ratings say it all, you should check them out as well.

Best Fuel Additive For Carbon Build Up

When it comes to the best fuel additive for carbon buildup, it is worth mentioning that there is a solution that performs like nothing else out there. And that is the Zmax Engine & Fuel Formula Kit.

This solution promises a lot. It says that it will reduce the carbon buildup in your engine and lubricates the metal. Increasing the engine life by a good margin.

In addition to this, this solution will also improve your fuel mileage and the car will perform well.

This product also enjoys favorable ratings and this is why we want to recommend it to you in this category. For experiences of this product, you can check the reviews.

Best Fuel Additive For Horsepower

Everybody wants his car to perform well on the track and an octane booster will do precisely that. So, if you are in the search of performance and want your car to perform really well on the track and squeeze every bit of performance from it, this product might be for you. And the best product when it comes to this job is the Rislone Super Concentrated Octane Booster.

This product will deliver the result you want. You can use this type of octane booster for both E10 and E15 fuels and one bottle will be good for 20 gallons of gas. Also, as the description says. It will not harm catalytic converters and O2 sensors.

Fuel Additives Facts: Choosing the Best Fuel Additive for Your Vehicle

  • Fuel additives can clean and lubricate the fuel system for better performance, especially for older engines or when high-test fuel is not readily available.
  • Not all fuel additives in the market are effective, and some are just snake oils or magic elixirs.
  • When choosing a fuel additive, it is important to consider factors such as its compatibility with your vehicle’s engine, its formulation, and its impact on the environment.
  • Lucas LUC10013 Fuel Treatment is the best overall fuel additive, suitable for both gas and diesel engines, and has a blend of strong compounds that clean and lubricate the fuel system for maximum performance.
  • Red Line Complete Fuel System Cleaner is the best value fuel additive, designed to prevent the buildup of gum, carbon, and varnish in gas engines, promote fuel stability, and reduce the need for high-octane gas.
  • Star Tron Enzyme Fuel Treatment Concentrate is an honorable mention for its ability to cure and prevent ethanol fuel problems for better engine performance, stabilize gasoline for up to two years, and not be harmful to the system in case of overdose.
  • Opti-Lube XPD Formula Diesel Fuel Additive is the best for diesel engines, formulated to clean and promote fuel stability, prevent clogging of the fuel system in cold weather, and treat up to 512 gallons of fuel.
  • Helix Racing Products 5-in-1 Ultimate Fuel Additive is the most versatile fuel additive, suitable for both two-stroke and four-stroke engines, cleans, protects, and boosts octane, and can be used in fuel-injected or carbureted engines.
  • STA-BIL 360 Marine Ethanol Treatment and Fuel Stabilizer is the best for marine engines, formulated to prevent corrosion above and below the fuel line, stabilize fuel for up to one year, and improve power and fuel efficiency.
  • Torco Fuel Accelerator is the best octane booster, significantly boosts fuel octane, is safe for use with emissions equipment, and can improve engine life and power.
  • When selecting a fuel additive, it is important to check the manufacturer’s specifications, pros, and cons to ensure it meets your vehicle’s needs and offers value for your money.


In this article, we have covered quite a bit when it comes to the best fuel additive. First, we learned what is a fuel additive and the different types of additives that exist.

Then we learned in what situations you should use these additives in your car and then we listed the best fuel additive for certain categories.


Now let’s answer some frequently asked questions.

Do Fuel System Cleaners Work

They work in a way that they use a special formula that causes the gum deposits from the fuel to decompose and to be injected into the combustion system. This cleans the injectors and fuel lines in the process. Using this type of cleaner on gas that contains Ethanol is recommended.

Can Fuel Injector Cleaner Cause Problems

Well, in most scenarios it cannot cause problems. But if you have a ton of debris that will be released, it can completely clog some of the injectors and prevent the fuel to flow. This is why in some vehicles that have partly clogged injectors is recommended manual cleaning of the injectors instead of using these solutions

How To Treat Bad Gas In Car

You can treat bad gas with a special additive that is intended to rejuvenate old gasoline. The best fuel additive when it comes to this is the STA-BIL Storage Fuel Stabilizer. With this solution, you will rejuvenate the old gas in your car. But still, if the gas is too old like 5 or 10 years old, you might be better with doing a flush of the system and adding new fuel.

How To Rejuvenate Old Gasoline

You can rejuvenate old gasoline with the STA-BIL Storage Fuel Stabilizer. This solution will work well with gas that is older and also if you plan to store your car. It will prevent the gas from spoiling for up to 2 years.

How To Clean Fuel Injectors Without Removing Them

In order to clean the injectors, you can use a fuel injector cleaner. This type of solution should be poured into the gas tank and then the car should run like this for a while. The solution will decompose most of the debris that has accumulated in the fuel system.

How To Use Fuel Injector Cleaner

These cleaners are fairly simple to use. You just fill up the tank and you pour the solution inside of the fuel tank. Then you run the engine with this solution until the gas tank is empty. It’s that simple to use.

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