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Diesel Additive Comparison - October 2025
7 Best Diesel Additive In the UK
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service levels, popularity trends, and more. The rankings reflect our opinion and should be a good starting point for shopping. By purchasing the products we rank, you’ll get the lowest price we found while we may receive a commission at no cost to you, which will help us continue to provide you with value.
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Overview: Need to improve performance and extend the life of your diesel engine? Look no further for reviews on the best diesel additives. Get an in-depth look at the pros and cons of each product to help you make an informed decision.
STP Ultra 5 in 1 Diesel Fuel System Cleaner 400ml , Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK
Model
Redex Diesel Fuel System Cleaner 250ml, Diesel Additives To Remove Harmful Emissions, Maximise Performance & Increase Fuel Economy With Redex Fuel Additives For Diesel Engines, Suitable For Hybrids
Model
Dipetane 1L Fuel Additive | Improve Fuel Economy | Reduce Emmisions | DPF Cleaner Diesel and Petrol | Flush and clean Engine, Injector and EGR valve
STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner and Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UK
Brand
Wynn's
Brand
Wynn's
Brand
STP
Brand
Redex
Brand
DIPETANE
Brand
Liqui Moly
Brand
STP
Reviews
2,415 reviews
Reviews
7,140 reviews
Reviews
9,120 reviews
Reviews
9,120 reviews
Reviews
3,558 reviews
Reviews
3,885 reviews
Reviews
282 reviews
Features
Worth the money
9.4
Worth the money
9.6
Worth the money
9.4
Worth the money
9.4
Worth the money
9.4
Worth the money
8.6
Worth the money
7.7
Simple to use
9.9
Simple to use
9.9
Simple to use
9.9
Simple to use
9.9
Simple to use
9.9
Simple to use
9.6
Simple to use
8.9
Distance
9.3
Distance
9.6
Distance
9.1
Distance
9.1
Distance
8.9
Distance
8.6
Distance
7.7
Tech Specs
manufacturer part number
76401
manufacturer part number
12264
manufacturer part number
-
manufacturer part number
RADD1201A
manufacturer part number
DP001
manufacturer part number
3722
manufacturer part number
-
item weight
500 g
item weight
300 g
item weight
-
item weight
230 g
item weight
950 g
item weight
203 g
item weight
-
customer reviews
4.6 4.6 out of 5 stars 805 ratings 4.6 out of 5 stars
customer reviews
4.5 4.5 out of 5 stars 2, 380 ratings 4.5 out of 5 stars
customer reviews
-
customer reviews
4.6 4.6 out of 5 stars 3, 040 ratings 4.6 out of 5 stars
customer reviews
4.6 4.6 out of 5 stars 1, 186 ratings 4.6 out of 5 stars
customer reviews
4.6 4.6 out of 5 stars 1, 295 ratings 4.6 out of 5 stars
Here are the top 3 recommended products with more information to help you find the right product for you
9.7
1
Wynn's
Wynn's High Performance Diesel Fuel System Treatment - Enhances Combustion, Improves Acceleration, Reduces Fuel Consumption & Black Smoke - 500ml
9.9Simple to use
9.4worth the money
9.3distance
Why we love it
Boosts engine performance instantly.
Reduces diesel fuel consumption.
Protects against engine wear.
Main highlights
TREATS UP TO 70 LITRES WITH ONE 500ML BOTTLE: The concentrated nature of this formula ensures that a single 500ml bottle is sufficient to treat up to 70 litres of diesel fuel. This high-yield ratio makes it a cost-effective solution for those looking to maintain peak engine performance without frequent applications. Suitable for cars, vans, trucks, and other diesel-powered machinery, this treatment integrates seamlessly into routine maintenance schedules. Its easy-to-use format allows it to be poured directly into the fuel tank, ensuring fast action and visible results.
REDUCES FUEL CONSUMPTION FOR COST-EFFICIENT DRIVING: By promoting more complete combustion, this treatment directly contributes to a reduction in fuel consumption. It maximises the energy extracted from each litre of diesel, helping the engine to deliver better mileage without compromising performance. Whether used in long-distance driving or frequent short trips, this product supports fuel efficiency by optimising the way diesel is burned. The result is lower fuel costs over time and less frequent refuelling. Regular application helps maintain this improved fuel economy, making it a smart choice for fuel-conscious drivers and fleet operators alike.
REDUCES BLACK SMOKE FOR CLEANER EMISSIONS: This advanced diesel system treatment addresses one of the most visible signs of inefficient fuel use: black smoke. By improving the combustion process, the treatment drastically reduces unburned hydrocarbons that manifest as dark exhaust. This contributes not only to a cleaner vehicle but also to a more environmentally friendly operation. Vehicles treated with this formula emit noticeably less smoke, which can be a critical factor in passing emission tests or complying with urban environmental regulations.
PROTECTS THE FUEL SYSTEM FROM OXIDATION AND CORROSION: The formula includes special additives designed to shield the fuel system from the damaging effects of oxidation and corrosion. Diesel engines are particularly susceptible to water contamination and fuel degradation, which can lead to rust, corrosion, and the formation of sludge within the fuel tank and injection system. This treatment provides a protective barrier that inhibits these processes, extending the lifespan of fuel components such as injectors, pumps, and lines. It is especially beneficial in vehicles that are not used regularly, where stagnant diesel may pose a greater risk.
IMPROVES COMBUSTION FOR OPTIMAL ENGINE PERFORMANCE: This high-performance diesel treatment is formulated to enhance combustion efficiency immediately upon use. The powerful blend of active ingredients optimises the fuel-to-air ratio, allowing for a cleaner and more complete burn inside the engine. As a result, the engine runs more smoothly and efficiently, leading to improved throttle response and faster acceleration. Enhanced combustion also contributes to a reduction in harmful emissions and particulate matter, resulting in a cleaner exhaust. This makes it particularly effective for vehicles that operate under demanding conditions, where peak engine performance is essential.
RESTORES LOST ENGINE PERFORMANCE & REDUCES EMISSIONS: The Extreme diesel system cleaner revitalises the engine power by cleaning and protecting critical fuel system components. Improves throttle response, acceleration, and overall drivability by ensuring an uninterrupted fuel supply. Reduces harmful exhaust emissions by promoting cleaner combustion and minimising unburned fuel residues. Helps the engine run more smoothly and quietly, reducing vibrations and improving overall efficiency. Supports compliance with emission standards by lowering carbon monoxide, nitrogen oxides, and particulate matter in exhaust gases.
RESTORES FUEL ECONOMY: This product helps optimise fuel consumption by ensuring a cleaner and more efficient fuel-burning process. By eliminating harmful deposits and improving fuel atomisation, it contributes to a smoother and more complete combustion cycle. This results in less fuel waste and improved miles per gallon, allowing for greater cost savings over time. By restoring lost performance, the cleaner enables engines to operate at peak efficiency, reducing unnecessary fuel consumption caused by inefficient combustion. Ideal for vehicles experiencing a decline in fuel economy due to carbon build-up and fuel injector blockages.
PREVENTS PROBLEMS WITH TURBO, EGR VALVE & DPF: Designed to maintain the cleanliness of crucial engine components such as the turbocharger, Exhaust Gas Recirculation (EGR) valve, and Diesel Particulate Filter (DPF). Helps prevent carbon and soot build-up, which can lead to blockages and reduced performance. By keeping these components clean, it enhances engine efficiency and reduces the risk of costly repairs. Supports proper airflow and exhaust circulation, ensuring smooth turbo operation and reducing emissions. Helps to minimise common diesel engine issues such as sluggish acceleration, excessive smoke, and reduced power caused by carbon deposits.
ELIMINATES AND AVOIDS STARTING PROBLEMS: Effectively addresses hard starting issues caused by contaminated fuel or clogged injectors. Ensures a smoother ignition process by restoring proper fuel flow and combustion efficiency. Helps eliminate rough idling, misfires, and hesitation that often result from a dirty fuel system. By cleaning the fuel injectors and fuel pump, it improves cold starts and reduces strain on the battery and starter motor. Ideal for vehicles that experience difficulties starting due to carbon deposits and injector blockages. Consistent use helps prevent future starting problems and maintains reliable engine operation under various driving conditions.
CLEANS THE ENTIRE DIESEL FUEL SYSTEM: Effectively removes dirt, carbon deposits, and other harmful residues that accumulate within the fuel system over time. Ensures a cleaner and more efficient combustion process by thoroughly cleaning key components such as the fuel pump, diesel injectors, and intake valves. By dissolving stubborn contaminants, it helps prevent clogging and improves the overall efficiency of the fuel delivery system. Designed to work in a single treatment, providing a powerful 'one tank' clean-up that restores optimal fuel system functionality.
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9.2
3
STP
STP Ultra 5 in 1 Diesel Fuel System Cleaner 400ml , Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK
9.9Simple to use
9.4worth the money
9.1distance
Why we love it
Enhances engine performance efficiently.
Improves fuel economy noticeably.
Protects engine from wear and tear.
Main highlights
What You'll Get - 400 ml Diesel Fuel System Cleaner
Restores Power and Performance - Recovers peak engine performance by removing harmful deposits
Protects Your Engine - Reduces friction and protects key engine parts from wear and corrosion
Concentrated Cleaning Power - Cleans and conditions the entire fuel delivery system in one tank
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Features
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Consumer Reviews
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Popularity
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Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.
When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
Value for money
TopChoice.co.uk compares product attributes to price, examines tech specs, ratings and reviews, and more.
When compared to other criteria, does the pricing seem reasonable? In order to provide genuine value for money, our team must answer that question with advanced calculations.
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9.4 
9.7
1Wynn's
Boosts engine performance instantly.
