Stanadyne Diesel Fuel Additive 4-Pack 8 oz — Performance Formula, Cetane Boost & Injector Cleaner

Stanadyne Performance Formula is a concentrated diesel fuel additive that cleans injectors, restores cetane, improves cold-flow properties, and helps recover lost fuel economy and power.

Designed for modern diesel engines and compatible with ultra-low sulfur diesel and biodiesel blends up to B20, this four-pack of 8 oz bottles (part number 38564) treats multiple tanks to help maintain smooth starts, reduce smoke, and protect fuel system components. The formula combines detergency, cetane-boosting chemistry, lubricity agents and demulsifiers so fuel stays cleaner, more stable and less corrosive to injection equipment.

How will this additive affect engine performance and fuel economy?

Regular use helps remove deposits from injectors and combustion chambers so fuel burns more completely. That can restore lost horsepower and torque while improving miles per gallon compared with untreated fuel.

• Detergents clean injectors and nozzles for better spray patterns.
• Cetane improver enhances ignition for smoother running and easier starts.
• Independent testing has shown average MPG gains and measurable power recovery.

Will Stanadyne Performance Formula protect my fuel system and emissions equipment?

The blend is formulated to protect injection pumps, injectors and fuel lines without harming exhaust aftertreatment systems. It also restores lubricity to low-sulfur blends, helping reduce wear in high-pressure components.

• Lubricity agents reduce metal-on-metal wear in pumps and injectors.
• Corrosion inhibitors limit rust risk in fuel tanks and lines.
• Safe for cooled exhaust systems; contains no alcohol that can damage seals.

How does this product help in cold weather or when fuel quality is poor?

Performance Formula improves low-temperature flow and accelerates water separation so filters capture contaminants rather than letting them reach injectors. It also stabilizes fuel to slow oxidation and gum formation in stored diesel.

• Improves pour point and cold filter plug point, reducing gelling issues.
• Demulsifiers force tiny water droplets out so separators can remove moisture.
• Antioxidants help maintain fuel quality during storage or seasonal use.

How do I use the 8 oz bottles and how many tanks will one pack treat?

Each 8 oz bottle is a measured dose for a specified volume of diesel (follow label dosing for exact tank sizes). The four-bottle pack gives multiple treatments for recurring maintenance or several vehicles over a season.

• Shake bottle and add directly to the fuel tank before filling for best mixing.
• One bottle typically treats a defined gallon range—refer to label directions for your tank size.
• Keep a routine dosing schedule to maintain injector cleanliness and fuel stability.

Who is this for: Stanadyne Performance Formula 38564 is aimed at owners and operators of diesel cars, trucks, marine engines, farm equipment and fleet vehicles who want to protect injection components, improve cold-start behavior, and regain lost efficiency. It suits diesel users who run ultra-low sulfur fuels or biodiesel blends up to B20 and those who store fuel seasonally and need stabilizing and water-handling benefits.

Features at a glance:

• Improves Performance & Horsepower
• Cold Weather & Anti-Gel Protection
• Improves Fuel Economy
• Lubricates, Cleans & Protects
• Corrosion Preventative
• Exhaust Aftertreatment Safe
• ULSD & B20 Compatible