10 Best Diesel Fuel Additives

The STP Diesel Fuel Additive Treatment Bundle includes two powerful cleaners designed to improve diesel engine performance. It combines the Diesel Injector Cleaner and the Ultra 5-in-1 Diesel System Cleaner, which work together to clear clogged injectors, remove deposits, and promote smoother engine running. This bundle helps restore lost power and efficiency, which can reduce fuel consumption and lower harmful emissions.

It's suitable for all types of diesel engines, including those with common rail and catalytic converters, making it a versatile choice for most diesel vehicles. The products are easy to use—just pour into a full tank—and have been well received by users. Delivery is limited to mainland UK, which is an important consideration for buyers outside that area.

If you want a reliable, straightforward additive to clean your diesel system and potentially improve engine smoothness, the STP bundle is a solid option. For those seeking additives with specific features like anti-gelging or enhanced lubricity, it may be advisable to verify these properties separately.

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.

The Archoil AR6900-D Max Advanced Diesel Additive is designed to enhance the performance and efficiency of diesel engines. A key strength of this product is its highly concentrated formulation, with 100% active ingredients, meaning that just 1 ml can treat up to 1 liter of diesel, making it both economical and effective for large quantities of fuel. It promises to convert standard diesel into high-performing super diesel fuel, primarily through the use of pure 2-EHN cetane improver and a unique ester lubricant.

This additive stands out by offering a comprehensive cleaning action for various engine components including the fuel injectors, DPF filter, EGR valve, and turbocharger. This can be particularly beneficial for maintaining engine health and reducing maintenance costs over time. By improving cetane numbers, it enhances engine performance, potentially resulting in smoother operation and better fuel economy. Additionally, it helps lower harmful emissions, which is advantageous for environmentally-conscious users.

Another consideration is that while it claims to resolve engine problems, results can vary depending on the existing condition of the engine and the quality of the diesel used. Some users might find the cost to be on the higher side, particularly for one-time users or those treating smaller amounts of diesel. But for those regularly using large diesel volumes, the advanced cleaning and performance-enhancing features could justify the investment.