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10 Best Diesel Fuel Additives 2025 in the UK

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Our Top Picks

#1

Winner

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

Rating
9.8
Chosen by1,482
Cetane Number Improver
Detergents
Emissions Reducers
Cetane Number Improver
A noticeable boost in performance with a smoother, more responsive engine and improved acceleration.
Detergents
Offers peace of mind by cleaning and protecting fuel injectors, preventing costly build-ups.
Emissions Reducers
Improves fuel economy, providing a slight but valuable increase in efficiency.

The STP Ultra 5 in 1 Diesel Fuel System Cleaner comes across as a comprehensive solution for diesel engine maintenance. Its concentrated cleaning power is designed to tackle deposits within the fuel delivery system, which can help in restoring lost power and improving engine performance. By enhancing lubricity and reducing friction, this product not only protects engine components from wear and tear but also works to lower diesel consumption, potentially leading to better fuel economy.

The inclusion of detergents and corrosion inhibitors further aids in maintaining a clean and smooth-running engine. Additionally, the product promises to reduce harmful emissions, making it a good fit for environmentally conscious users. However, while it offers a range of benefits, it should be noted that this product is best suited for routine maintenance rather than as a solution for severe engine issues. The 400 ml volume might be adequate for single-use or smaller engines but could be insufficient for larger vehicles or long-term treatment plans, requiring multiple purchases.

Users interested in a reliable diesel fuel additive that targets multiple engine concerns and enhances performance might find this product appealing, especially for regular maintenance purposes.

Rating
9.8
Chosen by1,482
Cetane Number Improver
Detergents
Emissions Reducers
Cetane Number Improver
A noticeable boost in performance with a smoother, more responsive engine and improved acceleration.
Detergents
Offers peace of mind by cleaning and protecting fuel injectors, preventing costly build-ups.
Emissions Reducers
Improves fuel economy, providing a slight but valuable increase in efficiency.
#2

Redex DPF Cleaner Diesel, DPF Diesel Particulate Filter Cleaner To Clear Soot Blockages Quickly & Avoid Costly Repairs, Hassle-Free DPF Cleaner To Prevent Clogging & Reduce Emissions, 250ml

Rating
9.6
Emissions Reducers
Emissions Reducers
Contributes to a reduction in exhaust emissions, aligning with environmental standards.

The Redex DPF Cleaner Diesel is specifically designed to maintain and clean Diesel Particulate Filters (DPFs), which is a crucial task to avoid costly repairs and reduce emissions. Its standout feature is its ability to clear soot blockages by lowering the combustion temperature, making it effective in preventing DPF clogging without needing higher engine temperatures. This can be especially beneficial for users who frequently drive short distances where the engine doesn’t heat up enough to naturally burn off soot.

Regarding ease of use, Redex offers a hassle-free application process with a bottle designed to pour directly into the fuel tank. This convenience is ideal for car owners who prefer a straightforward maintenance routine. The recommended usage is every 2-3 tanks of fuel, which ensures ongoing DPF cleanliness and efficiency.

Redex DPF Cleaner Diesel suits car owners primarily focused on DPF maintenance and those looking to prevent DPF-related issues cost-effectively. It is especially noted for its performance in DPF cleaning, indicating customer satisfaction. Users seeking a more all-encompassing diesel fuel additive may need to consider additional options.

Rating
9.6
Emissions Reducers
Emissions Reducers
Contributes to a reduction in exhaust emissions, aligning with environmental standards.

Buying Guide for the Best Diesel Fuel Additives

Choosing the right diesel fuel additive can significantly improve the performance and longevity of your diesel engine. Diesel fuel additives are chemical compounds formulated to enhance the quality and efficiency of diesel fuel. They can help in cleaning the fuel system, improving fuel economy, reducing emissions, and preventing fuel gelling in cold weather. To select the best diesel fuel additive for your needs, it's important to understand the key specifications and how they align with your vehicle's requirements and your driving conditions.
Cetane Number ImproverThe cetane number is a measure of the combustion quality of diesel fuel during compression ignition. A higher cetane number indicates that the fuel ignites more easily and burns more completely, leading to smoother engine operation and reduced emissions. Cetane number improvers can be particularly beneficial for older engines or those that experience rough idling. If you frequently drive in cold weather or have a high-performance diesel engine, look for additives that boost the cetane number.
Lubricity EnhancerLubricity enhancers are additives that reduce friction and wear in the fuel system, particularly in the fuel pump and injectors. This is crucial because modern ultra-low sulfur diesel (ULSD) fuels have lower natural lubricity, which can lead to increased wear and tear on engine components. If you want to extend the life of your engine and maintain optimal performance, choose an additive that includes lubricity enhancers.
Fuel StabilizerFuel stabilizers prevent the degradation of diesel fuel over time, which can lead to the formation of gums, varnishes, and other deposits that clog the fuel system. This is especially important if your vehicle sits unused for extended periods. If you store diesel fuel for long durations or have a backup generator, a fuel stabilizer can help maintain fuel quality and ensure reliable engine starts.
Anti-Gel AdditiveAnti-gel additives prevent diesel fuel from gelling or thickening in cold temperatures, which can clog fuel lines and filters, making it difficult to start the engine. These additives are essential for those who operate diesel vehicles in cold climates. If you live in or travel to areas with freezing temperatures, an anti-gel additive will help keep your fuel flowing smoothly.
DetergentsDetergents in diesel fuel additives help clean the fuel system by removing deposits from injectors, valves, and combustion chambers. This can improve fuel efficiency, reduce emissions, and restore lost power. If you notice a decrease in engine performance or fuel economy, or if you drive a high-mileage vehicle, look for additives with strong detergent properties.
Corrosion InhibitorsCorrosion inhibitors protect the metal components of the fuel system from rust and corrosion, which can be caused by water contamination in the fuel. This is important for maintaining the integrity and longevity of the fuel system. If you operate in humid environments or use biodiesel blends, which can attract more water, a corrosion inhibitor is a wise choice.
Emissions ReducersEmissions reducers are additives designed to lower the levels of harmful exhaust emissions, such as particulate matter and nitrogen oxides. These can help your vehicle meet environmental regulations and reduce its environmental impact. If you are concerned about air quality or need to comply with stringent emissions standards, consider an additive that focuses on reducing emissions.