Best Fuel Injector Cleaner for High Mileage Vehicles

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Your car engine’s ability to run smoothly and efficiently requires a suitable means of receiving the proper amount of air and fuel, which can fluctuate according to your vehicle’s demands.

All of this amounts to your car’s fuel injection system being an integral yet often overlooked component.

Traditionally, most auto-vehicles were fitted with carburetors, devices that controlled the flow of air and fuel. However, in modern times, these instruments have been replaced by fuel-injected engines, which are far more precise and sustainable.

Even so, these engines have their fair share of flaws, and they require proper maintenance in order to function properly. And for that, you will need to get your hands on some good fuel-injection cleaners.

Comparison Chart

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Red Line (60103) Complete SI-1 Fuel System Cleaner
Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner
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Chevron – 9280 Techron Fuel Injector Cleaner
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Gumout 510013 High Mileage Fuel Injector Cleaner
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STP High Mileage Fuel Injector Cleaner

Fuel Injector Cleaner Reviews

Red Line (60103) Complete SI-1 Fuel System Cleaner

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Your car’s engine can and will be affected by various factors across its lifetime. Dirt and debris can quickly cause your car to become more sluggish and moisture accumulation will further exacerbate any problems it may already have. All of this amounts to your engine dysfunction and high fuel consumption levels. Fortunately, there is a solution.


The first thing you will notice upon picking up a bottle of Red Line is the relatively low price of every one of the brand’s products. You may have reservations about purchasing something so cheap – (questions regarding its efficacy and longevity may abound) – but we are here to set your mind at ease.

The truth is this: the Red Line Complete SI-1 fuel system cleaner is a fantastic product that will exceed your expectations again and again. The product is packed with impressive features despite its low price tag, and you will find that it will go to work on your fuel injectors within seconds of application.

As if to drive the point home, the Red Line Complete Sl-1 contains polyether amines (or PEA for short), a well-known chemical for its effects on fuel-injection systems. The solution does quick work out of cleaning each one of your fuel injection system’s most important components, including the injectors themselves, pollution valves, and carburetors. 

Additionally, the solution is made even more effective thanks to the inclusion of powerful detergents which can operate under both high and low-temperature conditions. This should be welcome news for drivers with vehicles that have considerable mileage. The detergents themselves are completely safe and will not damage your car’s engine.

Because of the Red Line solution’s lubricating properties (in addition to its cleansing nature), your engine’s upper cylinder will also receive good treatment, thus preventing any leakages while your vehicle is in motion.

Finally, as if everything we have mentioned was not enough, the solution also encourages efficient fuel burn by stabilizing gasoline and minimizing the formation of varnish and gum, both of which can prevent your vehicle from running smoothly.

This is a fantastic product that makes for an easy recommendation to just about anyone. True gearheads may have higher standards, but this is just about as good as it gets when it comes to a cost-effective and highly-efficient fuel-injector cleaning solution.


  • Highly affordable
  • Incredibly effective
  • Promotes fuel-efficiency
  • It prevents the build-up of toxic compounds


  • Gearheads may find it lacking for more demanding vehicles

Liqui Moly 2007 Jectron Gasoline Fuel Injection Cleaner

If the Red Line Complete SI-1 Fuel System Cleaner is anything to go by, you do not need a loaded wallet to give your car the treatment it deserves. After all, as long as the necessary components are thoroughly cleaned regularly, your engine does not need much else in order to run smoothly. With that in mind, here is yet another cost-effective fuel-injection system cleaning solution that will have your engine up and running in tip-top shape in no time.


Liqui Moly is a fairly prominent brand within the vehicle maintenance industry. They offer an incredibly diverse array of items, with over 4000 different products relating to motor and transmission oils, fuel and oil additives, and vehicle care, among other things.

With such an abundance of products, it is easy to assume that they could not possibly meet your expectations with every single purchase. Fortunately, their 2007 Jectron Gasoline fuel injection cleaner exceeds those expectations and then some.

Firstly, the price of a single can of the solution is more than reasonable, considering its effectiveness. You will also find that just one can will last you for a long while (so long as you use it appropriately), saving you even more money in the long run.

On the technical side, this solution is perhaps most effective at removing carbon deposits and other harmful substances caused by emissions from fuel pipes, fuel distributors, and injection and inlet valves. These substances are highly detrimental to the proper functioning of your vehicle. The solution works quickly to remove them, thus greatly reducing any starting problems your vehicle may have had. 

Interestingly, when the solution takes effect, it reduces your vehicle’s carbon footprint by ensuring environmentally-compatible combustion. This is by no means unique to the product, but it is a large, recognizable brand doing its part to reduce carbon emissions. 

Naturally, in addition to all of this, the Liqui Moly solution promotes more fuel efficiency once it takes effect. Like the Red Line solution, we discussed previously, this mixture also contains polyether amines that drastically affect your fuel injectors. 

Of course, using this solution effectively means that you will not need to pay for the costly removal of your entire fuel-injector system to get it up and running again. However, it may not be as effective on extremely damaged or older vehicles, which may require full service. However, for most users, the Liqui Moly solution is perfect for general use. 


  • Cost-effective
  • Cuts down on carbon emissions
  • Reduces your overall carbon footprint
  • It takes effect almost immediately


  • It is not suitable for extremely damaged or older vehicles with extensive fuel-injection issues

Chevron – 9280 Techron Fuel Injector Cleaner – 20 oz.

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Oil is what keeps old-fashioned internal-combustion engine vehicles going. Understanding fuel injection systems is vital for knowing exactly how the car is powered and ensuring it stays working. Chevron’s Techron Concentrate Plus can be used in cars, dirt bikes, all-terrain vehicles, and even boat engines. It reduces rough idling issues.


Chevron is a universally-recognized brand known for providing high-end products that get the job done right, and this fuel injector cleaner is no different. Were it not for its hefty price tag, it may even take the cake as the best you will find on this list. 

The chemical composition effectively cleans and protects the fuel system. It also removes grit and gristle from the carburetors, intake valves, and combustion chambers. Finally, it also helps to restore fuel economy. All of this is fairly standard stuff for fuel injector cleaners, but this Chevron product goes the extra mile to ensure that your engine runs as though it were fresh off the factory floor. 

The solution does not damage your engine’s oxygen sensors or affect catalytic converters. It is completely safe for use in gasoline engines. It also restores your engine’s virility by cleaning up the fuel system and eliminating spark plug fouling, rough idling, and engine surge issues. Engine knock and ping issues are also significantly reduced. The solution is effective when used as part of a service program.

This fuel-injection cleaner from Chevron is an all-encompassing solution that will restore your car’s engine to a superior state. This is important because modern car engines are designed to work best when they are completely clean, thanks to their high-end tolerant capabilities. This solution is phenomenal enough that even accomplished gearheads would get great use. 


  • Thorough and efficient
  • Safe for use in gasoline cars
  • It greatly improves fuel efficiency while reducing engine issues
  • Competent and powerful enough to be used by accomplished technicians


  • A little pricey

Gumout 510013 High Mileage Fuel Injector Cleaner

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You should be fully convinced that a decent fuel-injector cleaner is necessary to maintain your vehicle’s condition. The more an engine is used, the more carbon deposits can build up, thus minimizing your vehicle’s potential and significantly reducing its performance. Especially when it comes to older models, a high-grade, specially-formulated fuel-injector cleaning solution is necessary. Enter the Gumout High Mileage Fuel Injector Cleaner.


We have spoken extensively of the negative effects carbon build-up can have on your engine. Typically, however, newer vehicles are far more resilient to their damaging, corrosive effects – so long as it is well-maintained, a fairly newish car can still run at peak efficiency.

The problem arises with older vehicles or those with high mileage. It is not uncommon for these old models to be regularly pulled apart in the hopes of fixing a bevy of issues. Procedures are costly and can put a significant dent into your bank account. 

Fortunately, this solution from Gumout has been specially formulated to clean out even the oldest of fuel injectors. The best part is that you save a huge amount of money, perhaps even more than if you were to purchase any of the other solutions on this list. 

Now, you may be skeptical of this product’s pedigree. After all, the manufacturer recommends that you use an entire bottle of the stuff in one go. Fortunately, you can purchase a single bottle by itself or a pack of six, which will last for over a year should you clean out your fuel injectors every three months (as recommended).

Naturally, the solution is effective at cleaning fuel injectors, intake valves, and ports, particularly in vehicles over 75,000 miles. This also prevents carbon build-up (for a while, at least) and improves your engine’s fuel economy.

This solution will not damage your engine’s oxygen sensors and is perfectly safe for use in turbocharged or supercharged vehicles. It will not void the manufacturer’s warranty. 

This amounts to a stellar product that earns the highest marks from us.


  • Incredibly efficient at preventing carbon build-up
  • Effects last for three months (or 3000 miles) at a time
  • Particularly effective for use in older vehicles
  • Safe for use in supercharged or turbocharged vehicles


  • One bottle is only good for a single-use

STP High Mileage Fuel Injector Cleaner and Carburetor Cleaner Treatment

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By this point, you have plenty of fantastic options to choose from, each of which will provide you with everything you need to improve your engine’s performance. However, if you need a little more diversity in your selection of options, we have one more product to talk about.


There is not much else to say for this high mileage fuel injector cleaning solution from STP that could not be said about any of the other great products on our list. Like the others, it eliminates harmful carbon deposits without negatively affecting your engine’s oxygen sensor. Additionally, it is safe for use in gasoline engines.

What makes this solution easy to recommend is its high value for the amount of money you spend. Like our previous suggestion, a full bottle is necessary to treat your engine. However, STP has doubled down on the number of bottles you can get in a pack. With every purchase, you will receive 12 bottles of fuel injector cleaning solution, treating roughly 21 gallons of gasoline. Therefore, a pack will effectively last you for a full year or more. 

Additionally, this solution is compatible with cap-less fuel systems. It is better used on newer vehicles with slightly less mileage than some older models. You may need something stronger for your old engine.


  • Rids your fuel injectors of harmful carbon deposits
  • It comes in a pack of 12, which can last for a year or more
  • Compatible with cap-less fuel systems
  • Relatively cheap


  • Not as strong as some of the other solutions on this list


There you have it. Those are the best fuel injector cleaning solutions we could find. We urge you to give one of them a try – you will thank us later when you discover how drastically it can improve your vehicle’s performance.

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