10 Best Diesel Engine Cleaner 2025 in the United States

The STP Multi-Purpose Motor Treatment and Fuel Stabilizer is a versatile cleaner designed for both gas and diesel engines, including two-stroke and four-stroke variants. It excels in cleaning power, capable of tackling engine deposits, fuel injectors, intake valves, and crankcase sludge, which helps restore lost horsepower and performance. Additionally, it offers upper cylinder lubrication to reduce friction, making it a solid choice for maintaining engine health. The product is also noteworthy for not containing alcohol, which can cause corrosion.

It's effective for engines in both use and storage by preventing rust, oxidative degradation, and fuel line freeze, and facilitating cold starts. This makes it useful for a variety of engine maintenance needs, particularly in seasonal or less frequently used machinery. The additive is easy to use, performing several functions seamlessly without requiring complex procedures, which is beneficial for users who prefer straightforward maintenance tasks.

In summary, this product is ideal for users seeking a multi-functional, effective cleaner for a range of engine types, especially those who value ease of use and comprehensive engine protection.

The Archoil AR6400-D Diesel Fuel System Cleaner is a powerful solution designed to rapidly clean essential components in diesel engines, including injectors, turbos, blocked DPFs, and dirty EGR systems. Its strong cleaning power helps restore engine performance, improve fuel economy, and ensure smoother idling. A significant advantage is its compatibility with all diesel systems, making it a versatile choice for various diesel vehicles.

The product's instructions recommend using one 12-ounce bottle to treat 40 gallons of diesel every 5,000 miles, highlighting its ease of use and convenience for regular maintenance. For those with Power Stroke engines, pairing it with the Archoil AR9100 Friction Modifier can address specific injector stiction issues and further enhance fuel system performance.

The Archoil AR6400-D offers robust cleaning capabilities, broad compatibility, and ease of use, making it well-suited for diesel vehicle owners looking to maintain their engine's performance and efficiency.

Hot Shot's Secret Diesel Extreme Clean and Boost is a potent diesel-engine cleaner that tackles the entire fuel system, including injectors, valves, pumps, and cylinders. With its ability to remove internal and external injector deposits, it is designed to keep engines running smoothly and efficiently.

The product also boosts cetane levels, improving fuel economy and increasing engine power, making it a good choice for those looking to enhance engine performance. Additionally, it contains rust and corrosion inhibitors, which further protect the engine components and disperse moisture effectively, addressing common diesel engine issues without using alcohol-based dispersants.

This cleaner is user-friendly, requiring a simple application of 8 ounces for every 20 gallons of fuel, making it convenient to use during regular fill-ups or every 6,000 miles.