Best Vehicle Additives of 2025

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Vehicle additives are a range of chemical compounds designed to improve the performance and longevity of vehicles. These additives can be added to the fuel, engine oil or transmission fluid, and can help to reduce emissions, improve fuel efficiency, and protect against wear and tear. They are widely used by car enthusiasts, mechanics and fleet managers to keep their vehicles running smoothly and to extend their lifespan. With a variety of options available, ranging from fuel system cleaners to engine oil stabilisers, there is an additive to suit every vehicle and budget.
At a Glance: Our Top Picks
Top 10 Vehicle Additives
HYDRA PIC-24 Petrol Injector Cleaner with Octane Booster
The HYDRA PIC-24 Cleaner is a powerful petrol injector cleaner that ensures your engine performs at its best. It is E10 compatible, protecting against corrosion and effectively cleaning fuel injectors and carburettors. With its octane booster, you can enjoy improved acceleration and reduced engine pinging. This additive is ideal for various petrol engines, including those with turbochargers and catalytic converters, enhancing combustion and maximising fuel efficiency. Additionally, it helps reduce harmful emissions, making your vehicle more environmentally friendly.
Dipetane DP001 Fuel Additive for Economy
The Dipetane DP001 Additive is designed to enhance your vehicle's performance by improving fuel consumption by up to 10%. This means you can enjoy longer journeys without frequent refuelling. Additionally, it can reduce car emissions by up to 25%, contributing to a cleaner environment. You will also protect your injectors from the adverse effects of low sulphur and poorly combusting fuel, ensuring smoother engine operation. Lastly, it helps to reduce greenhouse gas emissions, making your driving experience more eco-friendly.
LIQUI MOLY Cera Tec 3721 Engine Additive
LIQUI MOLY Cera Tec is a high-tech engine additive that enhances performance from the very first use. By using advanced ceramic compounds, it ensures smoother engine operation, which can lead to a longer lifespan for your engine. You will also benefit from lower fuel consumption and reduced emissions thanks to its ability to diminish friction. Adding it during oil changes is simple; just shake the 300 ml bottle and mix it with up to 5 litres of engine oil for lasting benefits of up to 50,000 km.
Slick-50 Engine Treatment for Enhanced Protection
The Slick-50 Engine Treatment is designed to protect your engine from friction and heat, particularly when under stress from towing or heavy loads. With its proprietary friction modifier, it creates a superior layer of lubrication, significantly reducing heat and ensuring smoother operation. The anti-wear agent forms a self-regenerating protective surface, preventing metal parts from grinding against each other. Additionally, a dispersant keeps your engine clean by stopping sludge and deposits from building up, helping to maintain optimal engine performance.
Redex Diesel Fuel System Cleaner 250ml
The Redex Diesel Additive is a specialist fuel treatment designed to enhance the performance of your diesel engine. It effectively removes harmful deposits that accumulate in the fuel system, helping to prolong your engine's life and improve everyday performance. By using this cleaner, you can achieve greater fuel efficiency, thereby reducing emissions and saving on fuel costs. Additionally, it is very easy to use; simply pour one shot into your fuel tank as needed to keep your engine running optimally.
DPF Additive PAT Fluid 1L for Citroen Berlingo
The DPF Additive PAT Fluid is a 1-litre solution designed specifically for Citroen Berlingo vehicles. It is particularly useful for maintaining the diesel particulate filter (DPF) system, helping to improve your vehicle's efficiency. By using this fluid, you can enhance the performance of your fuel system, ensuring smoother operation. Additionally, it meets various OE numbers, making it a reliable replacement for your vehicle’s requirements.
Wynn's AdBlue Preventative Crystallisation Cleaner Additive
Wynn's Crystallisation Cleaner is designed to prevent crystal formation in your AdBlue system, which helps you avoid costly repairs. It effectively cleans all components in the SCR system by dissolving light crystallisation found in the AdBlue tank, pump unit, and injector. By using this additive, you can eliminate breakdowns and downtime caused by AdBlue crystallisation, thereby prolonging the life of your vehicle's components. Simply add one 125ml bottle to your AdBlue tank at every refill to treat up to 15 litres of AdBlue.
Carlube AdBlue 10 Litres with Easy Pour Spout
Carlube AdBlue is a specially formulated diesel exhaust fluid designed for use in selective catalytic reduction systems. It effectively reduces harmful nitrogen oxides in your vehicle's emissions, helping you meet strict European Union standards. By using this product, you can enjoy a 5% reduction in fuel costs, making it a cost-effective choice for drivers. The 10-litre container is convenient for a variety of vehicles, ensuring that you have enough fluid for your needs.
Wynn's Super Charge Oil Treatment for Engines
Wynn's Super Charge Oil works effectively to enhance the viscosity of lubricating oils, ensuring that they perform well even under heavy loads or high temperatures. By restoring compression and oil pressure, this additive helps reduce excessive oil consumption and minimise exhaust smoke, making your engine run cleaner. It also creates a solid lubricating film, which protects older engines from metal-to-metal contact, reducing wear. Additionally, you’ll appreciate how it quietens noisy engines while safeguarding against corrosion and oxidation.
HYDRA MAXIMUS Diesel Injector Cleaner 1 Litre
The HYDRA MAXIMUS Cleaner is designed for highly tuned diesel engines, acting as a powerful fuel stabiliser and cleaner. It effectively cleans fuel lines, pumps, and injectors, ensuring optimal engine performance. With its unique formula featuring a cetane booster, it enhances cold starting and provides a smoother engine operation. Additionally, it significantly reduces harmful emissions and improves fuel economy, making it an excellent choice for those looking to maintain their diesel engine's efficiency and longevity.
Frequently Asked Questions (FAQs)
1. What are vehicle additives?
Additives are substances that are added to engine oil, transmission oil and coolant to improve their properties. Additives are even added to fuels and oils in refineries. Without additives, neither fuel nor oil would be able to deliver the required power.
2. Do engine additives really work?
On older cars, fuel additives will likely improve your engine's performance because older vehicles tend to have more gunk that builds up in the fuel injectors. Additives can help clean out those deposits and prevent expensive car maintenance down the road.
3. Is fuel additives any good?
The additives themselves claim to benefit your vehicle in numerous ways, from cleaning carburettors, injectors and intake valves, to keeping your fuel system free from excess water. In layman's terms, fuel additives promise better fuel economy, better performance, lower emissions and a prolonged engine life.
During our vehicle additive research, we found 286 vehicle additive products and shortlisted 10 quality products. We collected and analyzed 183,023 customer reviews through our big data system to write the vehicle additives list. We found that most customers choose vehicle additives with an average price of £19.45.
The vehicle additives are available for purchase. We have researched hundreds of brands and picked the top brands of vehicle additives, including HYDRA, DIPETANE, Liqui Moly, Slick 50, Redex. The seller of top 1 product has received honest feedback from 384 consumers with an average rating of 4.9.

Joseph is a seasoned writer who's also passionate about automotive. His passion for automotive care and maintenance fuels his drive for more knowledge in the field. He currently resides in Middlesbrough, where he finds time to write informative contents on automotive. His automotive related articles are quite popular in journals around the world. Joseph continues to use his wealth of experience in the industry to create helpful guides on automotive.