10 Best Gas Stabilizers 2025 in the United States

The STA-BIL Storage Fuel Stabilizer is designed to keep gasoline fresh for up to two years, making it ideal for seasonal equipment or vehicles that sit unused for long periods. It works with all types of gasoline, including ethanol blends, providing versatility and reliability for most fuel types. One of its key benefits is preventing gum and varnish buildup, helping engines run smoothly and avoiding costly maintenance. The product is simple to use—just add the recommended amount to the fuel tank, eliminating the need to drain gas before storage and simplifying preparation.

Many users report that it ensures quick, easy starts after storage, which is a common concern for stored fuel. The 4 fl. oz. bottle is best suited for smaller tanks, so larger tanks may require multiple bottles or careful measurement to avoid incorrect dosage. While very effective for long-term storage, it is unnecessary for fuel that will be used within a few weeks. This stabilizer is well-suited for anyone who stores fuel for lawnmowers, boats, motorcycles, or backup generators and wants to prevent fuel degradation and engine issues after storage.

The STAR BRITE Star Tron Enzyme Fuel Treatment is a versatile gas stabilizer that works with a wide range of vehicles and gas-powered tools, including passenger cars, ATVs, motorcycles, and marine equipment. One of its standout features is its ability to stabilize fuel for up to 2 years, which is impressive for vehicles or equipment that sit idle for long periods. Additionally, it helps rejuvenate old fuel and prevent ethanol-related issues like poor performance and reduced fuel economy.

The product claims to improve fuel economy by removing gum, carbon deposits, and varnish build-up, thereby enhancing engine performance and reducing emissions. The ease of use is a significant plus; it can be added to the fuel tank without the need for precise measurements or worrying about overdosing.

Despite some minor drawbacks, such as the concentrated formula being a bit overboard for casual users and its weight and size making it less convenient for on-the-go usage, it remains an excellent choice for maintaining a vehicle's fuel system in optimal condition. The STAR BRITE Star Tron Enzyme Fuel Treatment is especially suited for those who own multiple types of vehicles and need a reliable all-in-one fuel stabilizer.

The STA-BIL 360 Marine Ethanol Treatment is designed specifically for marine engines and watercraft, making it a solid choice for boaters and water sports enthusiasts. It helps stabilize fuel by preventing ethanol-related damage, which is important since ethanol can attract moisture and cause corrosion in engines. This product not only protects against corrosion but also helps clean the fuel system, potentially improving engine performance during the season.

It treats up to 100 gallons of fuel with a 10 fl. oz. bottle, which is a convenient concentration for various fuel tank sizes. The formula is advanced for water environments, helping to remove moisture—a common issue in marine settings. Its ease of use is straightforward: add it directly to the fuel tank, making it user-friendly for those who want simple maintenance.

This product is best suited for marine engines using ethanol fuels and balances protection and fuel system cleaning effectively. It is primarily intended for watercraft rather than general automotive use.