Stanadyne Diesel Fuel Additive Performance Formula — 2 Pack 1/2‑Gallon Jugs, Cleans Injectors & Improves Cetane

Stanadyne Performance Formula is a concentrated diesel fuel additive sold as two 1/2-gallon jugs that treat a combined 500 gallons to clean injectors, improve cetane, boost fuel economy and protect fuel systems.

Built for on-road, off-road and marine diesel engines, this two-pack delivers Stanadyne’s long-standing detergent, cetane-improver and lubricity technologies in a single treatment. Each 64‑oz jug treats 250 gallons of diesel, so the pair covers large tanks or multiple refills. The formula is designed for modern ultra-low sulfur diesel and is compatible with biodiesel blends up to B20.

How does this additive improve engine performance?

The Performance Formula clears deposits from injectors, pumps and nozzles so fuel sprays and combusts more efficiently. That cleaner combustion translates to smoother running, quicker acceleration and recovered power without altering engine hardware.

• Detergents break down and remove injector and combustion chamber deposits
• Cetane improver promotes more complete combustion and easier starts
• Reduced smoke and particulates from cleaner fuel delivery

Will it help me save fuel and lower emissions?

Independent testing indicates average fuel economy gains, with some users seeing increases up to nearly 10%. By improving combustion efficiency and reducing deposits that foul engines, the additive can cut visible smoke and particulate output.

• Average MPG improvement around 4%, with higher gains possible
• Cleaner injectors mean more consistent fuel delivery and economy
• Designed to lower smoke and particulate emissions from combustion

Does it protect the fuel system and work in cold conditions?

Yes—the formula contains lubricity agents, corrosion inhibitors and stabilizers that restore lubrication to ultra-low sulfur fuels, help prevent rust and keep fuel fresh. Cold‑flow additives improve pour point and cold filter plug performance, aiding start-up and filtration in chillier climates.

• Lubricity improvers reduce wear on pumps and injectors
• Corrosion inhibitors protect metal fuel-system components
• Improves pour point and cold filter plug point, enhancing cold-weather reliability

How do I use these two 1/2-gallon jugs and what applications fit?

Each 64‑oz jug treats 250 gallons; use the recommended dose when filling or top-treat bulk tanks for ongoing maintenance. The product is suitable for nearly all diesel applications, including trucks, tractors, generators and marine vessels when used at the correct treat rate.

• Two jugs treat a total of 500 gallons of diesel fuel
• Works with ultra-low sulfur diesel and biodiesel blends up to B20
• Safe for engines with exhaust aftertreatment systems when used as directed

Who is this for: Owners and operators of diesel vehicles and equipment who want a professional-grade fuel treatment to restore power, reduce fuel use, protect fuel-system components and improve cold-weather performance. Ideal for fleets, farmers, marine operators and anyone maintaining bulk storage or seeking measured, repeatable fuel treatment across multiple tanks.

Features:

• Made in the U.S.A. Restores and increases horsepower through deposit cleaning.
• Reduces fuel consumption—tests show an average of 4% improvement in MPG, with gains up to 9.6%.
• Cetane improver for easier starts, smoother running and reduced engine noise.
• Lubricity enhancers restore protection lost in ultra-low sulfur diesel fuels.
• Reduces smoke and particulates while cleaning and protecting injection components.