10 Best Diesel Fuel Stabilizers 2025 in the United States

The SAFECASTLE PRI-D and PRI-G Fuel Stabilizer Combo-Pack is a dual solution aimed at enhancing diesel and gasoline fuel quality and longevity. For diesel, the PRI-D treatment is highly effective in emergency scenarios, offering increased fuel lubricity, which is crucial for keeping tanks and fuel lines sludge-free and maintaining engine performance. It also significantly extends the lifespan of fuel pumps by reducing wear on ultra-low sulfur diesel (ULSD) fuels by up to 45%.

The PRI-G component focuses on gasoline, preserving its freshness and preventing deterioration, which is critical during disasters or emergencies. Both products boast an impressive shelf life; unopened bottles last indefinitely, and opened bottles are good for up to three years.

Users also report notable fuel economy improvements, with PRI-G providing up to 15% better mileage. Additionally, the formulation helps keep engines cleaner, thereby reducing maintenance costs.

The Power Service Diesel Kleen+Cetane Boost is a diesel fuel stabilizer designed to clean injectors, prevent sticking, and restore lost power and fuel economy. It contains a Slickdiesel Lubricator, which protects fuel pumps and injectors from wear, especially useful for Ultra Low Sulfur Diesel (ULSD) fuel. This product is compatible with all diesel fuels, including ULSD, biodiesel, and biodiesel blends, making it versatile for various users.

With strong detergent additives, it effectively removes both internal and external deposits on fuel injectors, contributing to better engine performance. It has a high customer rating of 4.8 out of 5 stars, indicating user satisfaction. For those primarily seeking a product to maintain fuel injectors and improve engine efficiency, this could be an excellent choice.

The Power Service 1025-12PK +Cetane Boost Diesel Fuel Supplement Anti-Freezer is a solid choice for those looking to maintain their diesel fuel's quality.

One of its standout features is its ability to prevent fuel gelling, which is essential for cold weather operation. This is complemented by its protection against fuel-filter icing, ensuring smooth functionality even in harsh conditions. The cetane boost is a notable advantage, facilitating faster cold starts which can be particularly beneficial in winter months.

Additionally, the Slick diesel Lubricator is a valuable inclusion, protecting fuel pumps and injectors from wear caused by low-quality Ultra Low Sulfur Diesel (ULSD) fuel. This product is effective across all diesel fuels, including ULSD and biodiesel blends, making it versatile and compatible with a wide range of diesel engines. This diesel fuel stabilizer is best suited for individuals dealing with cold weather conditions and those using lower quality diesel fuels who need additional protection for their engine components.