After plenty of research and testing some of the formulas, we found that the best fuel injector cleaner is the STP Ultra 5-in-1. It’s suitable for both petrol or diesel powered cars and is designed to clean and protect the fuel system and injectors. However, if you would prefer a dedicated diesel fuel injector cleaner, the brand offer a diesel specific formula.
In order to rate the fuel injector cleaners, not only did we test a number of formulas (as shown in the image above), we also rated them based upon certain factors. These factors included their cleaning abilities, brand reputability, treatment duration and value for the money.
Table of Contents
Fuel Injector Cleaner Comparison
|Fuel Injector Cleaner||Type||Treatment|
|STP Ultra 5-in-1||Petrol/Diesel||Every 4,000 Miles|
|Redex Fuel System Cleaner||Petrol||Every Tank|
|Wynns 55964||Petrol||Every Three Months|
|STP Diesel||Diesel||Every 3,000 Miles|
|Hydra Power Blast||Diesel||Every Three Months|
|Forte Diesel Specialist||Diesel||Every Three Months|
For the best results when using a fuel injector cleaner, it’s advised that you pour the formula into the tank before you fill up with fuel. This allows the fuel and cleaner to mix more efficiently rather than the formula just sitting on top of the fuel if it was to be poured in afterwards.
Below is a list of the best fuel injector cleaners that restore performance, reduce fuel economy and easily mix with a full tank of fuel.
The Best Fuel Injector Cleaner
1. STP Ultra 5-in-1 System Cleaner
The STP brand produce a number of fuel injector cleaners but their Ultra 5-in-1 formula is by far the best. It’s designed to clean both the fuel system and injectors as well as prevent the build up of harmful deposits.
Other features of the STP Ultra 5-in-1 include:
- Concentrated 400 ml bottle
- Restores peak performance
- Reduces friction and inhibits corrosion
- Designed for use every 4,000 miles
- Treats 50/60 litres of fuel per bottle
- Available in a diesel equivalent formula
Although expensive when compared to some of the alternatives, the STP Ultra 5-in-1 is the best fuel injector cleaner in the UK and worth the added investment. It completely clears out the fuel system and injectors whilst also providing preventative measures to prolong peak performance.
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2. Redex Petrol Fuel System Cleaner
Redex are a brand that specialize in additives and their petrol system cleaner is one of their most rated products. It’s designed to restore performance and reduce emissions from a single treatment to a full tank of petrol.
Other features of the Redex Fuel System Cleaner include:
- Use every tank of fuel
- Available in a 250 ml or 500 ml bottle
- Suitable for all petrol engines
- Cleans and reduces emissions
Overall, it’s one of the cheapest fuel injector cleaners that’s actually worth buying and it won’t disappoint. For the best results, it’s worth pouring a bottle into every full tank of fuel, which will help maintain peak performance and efficiency.
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3. Wynns 55964 Fuel Injector Cleaner
The Wynn’s Injector Cleaner is another highly rated formula that’s designed for petrol powered vehicles. From a single treatment of the formula, the brand states that it will clean and maintain the fuel system to its optimum condition.
Other features of the Wynn’s Fuel Injector Cleaner include:
- Safe for turbochargers and catalytic converters
- Reduces fuel consumption
- Maximizes engine performance
- Bottle treats 50 litres of fuel
- 325 ml bottle
Overall, the Wynn’s Injector Cleaner is an excellent all-round option that’s affordable and highly effective. For the best results, it’s advised that you use the cleaner every three months or every third full tank of petrol.
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4. STP Diesel Injector Cleaner
Another STP injector cleaner that’s highly rated is their formula dedicated for bio and regular diesel cars. According to the brand, it’s able to unclog dirty injectors in one tankful to restore lost performance and fuel economy. For the best results, the brand recommend using this injector cleaner every 3,000 miles so that your car continues to run smoothly.
Other features of the STP Diesel Fuel Injector Cleaner include:
- Cleans and prevents further build up of deposits
- Restores lost performance and improves fuel economy
- Pours into a full tank of diesel
- 200 ml bottle
- Available as a petrol alternative
Overall, this STP formula is the best diesel fuel injector cleaner that’s relatively affordable and provides great results. It’s also produced by the highly reputable brand that specialize in additives for complete peace of mind.
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5. Hydra Diesel Power Blast Injector Cleaner
The Hydra Diesel Power Blast is a premium fuel injector cleaner that cleans the injectors and stabilizes the fuel. According to the brand, it can be used in all types of diesel engines, which includes cars, vans, boats, generators, military vehicles and much more.
Other features of the Hydra Diesel Power Blast include:
- Available in 250, 500, 1000 or 2000 ml bottles
- 50 ml treats 50 litres of diesel
- Cleans and protects the injectors
- Suitable for all diesel engines
- Improves fuel stability
Although expensive, the Hydra Power Blast is a high quality diesel fuel injector cleaner and worth paying the extra. Considering that just 50 ml treats 50 litres of diesel, the full bottle will go along way and won’t disappoint.
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6. Forte Diesel Specialist Injector Cleaner
Forte are a brand well-known for their highly rated DPF cleaner but they also produce a range of other additives such as this fuel injector cleaner. The “Specialist” formula is designed to provide rapid cleaning of the injectors by removing harmful deposits that have built up over time.
Other features of the Forte Diesel Specialist Injector Cleaner include:
- 400 ml bottle size
- Compatible with all diesels
- Promotes easier cold starting
- Lowers exhaust emissions
- Mixes with 40 litres of diesel fuel
If it wasn’t for the expensive price tag, the Forte Specialist Injector Cleaner would be matching the STP alternative as the best. It pours straight into the fuel tank and specifically targets the injectors for better all-round performance. If the price isn’t an issue and you prefer to buy from the reputable Forte brand, their formula won’t disappoint.
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How We Rated The Fuel Injector Cleaners
Due to the large amount of fuel injector cleaners on the market, it can be difficult to find the best that promise results. To help you choose the best, we have based our recommendations upon testing and research. After using the STP Diesel formula in one of my diesel cars, I certainly saw an increase in miles per gallon on long motorway drives. We have also been using the Redex formula in some of our petrol cars for many years too.
In terms of our research, our recommendations are also rated based upon their cleaning abilities, brand reputability, treatment duration and value for the money.
Fuel injector cleaners have been proven to work on a range of vehicles and can completely change their performance. From a sharper throttle response to improved fuel economy, there is a whole list of improvements that can be made.
All of our recommendations are suited to both diesel or petrol cars and simply pour into a full tank of fuel. For the best results, it’s advised to pour the cleaner into the tank before filling the tank up to the brim.