10 Best Diesel Additives 2025 in the UK

The Archoil AR6900-D Max Advanced Diesel Additive Concentrate is a high-performing option for anyone looking to enhance the quality of their diesel fuel. This product's standout feature is its high concentration, with a 5-liter bottle capable of treating up to 5,000 liters of fuel, making it a cost-effective choice for those who use large volumes of diesel. It's designed to convert low-quality diesel into what the manufacturer describes as 'Super Diesel Fuel', using a formulation that includes cetane improvers, multiple detergents, and ester lubricants. This makes it compatible with all diesel engines, promising not only improved cold starts and reduced diesel knock but also a more thorough cleaning of critical engine components like fuel injectors, DPF filters, EGR valves, and turbos.

The AR6900-D Max is particularly beneficial for users looking to maintain and boost engine performance while also aiming to lower exhaust emissions. It addresses common engine problems with a proprietary blend of cleaning agents and offers a notable improvement in fuel economy. However, this advanced formulation means that it might be best suited for those who are familiar with using diesel additives or who are experiencing specific engine issues that need resolving.

While the product claims to transform any diesel engine, it's important for users to understand that results can vary depending on the condition of their vehicle and driving habits. Additionally, those who are looking for a simple, everyday additive may find the extent of its effects and the price point more than what they need. The AR6900-D Max has found favor among many users, evident from its high customer ratings, suggesting a strong performance within its category.

The Cataclean Diesel Complete Fuel & Exhaust Cleaner is designed with multiple benefits in mind, aiming to improve engine performance, fuel efficiency, and reduce emissions. One of its primary strengths is its comprehensive cleaning capability, tackling various engine components including the fuel tank, injectors, catalytic converters, and more. This makes it a versatile option for maintaining diesel engines.

Users will appreciate its ability to reduce emissions by up to 60%, which is particularly useful for passing MOT emissions tests and contributing to a cleaner environment. Additionally, the product's regular use can help restore engine performance and potentially reduce maintenance costs over time. Compatibility is another strength, as it is safe for all diesel engines, making it a convenient choice for a wide range of vehicles.

The recommended concentration is straightforward—500ml per 15 litres of fuel every three months—making it easy for users to follow. Some users might find the need for regular, consistent application every three months to be a bit demanding. Also, the product is mainly geared towards regular maintenance rather than being a one-time fix, which could be a drawback for those looking for an immediate solution. In terms of seasonal use, the product does not have any specific limitations, making it suitable for year-round application. The additive type is a fuel additive, focusing on cleaning and maintaining the engine's internal components. Cataclean Diesel offers a strong solution for those looking to maintain their engine's health, improve fuel economy, and lower emissions, despite requiring consistent use for best results.

The Archoil AR6400-D MAX Pro is a diesel additive designed to clean and enhance diesel engines. It targets various engine components like the diesel particulate filter (DPF), EGR, turbo, and fuel system, making it suitable for all diesel engines. A significant strength of this product is its concentrated formulation, which claims high strength in carbon removal and emissions reduction, potentially making it a cost-effective choice for enhancing fuel economy and restoring engine performance.

The additive boasts a full ester lubrication, which may help with smoother engine performance and improved fuel mileage. It acts as a multi-functional cleaner, which includes properties as a cetane improver and water remover. This versatility might appeal to diesel engine owners facing running issues or those who regularly deal with emissions concerns.

One potential drawback could be its seasonal use limitations. Despite its broad compatibility claim, it is essential to check whether its application is straightforward for your specific engine model. This product might be an excellent choice for those looking to maintain their vehicle’s performance and efficiency with a trusted diesel additive.