Stanadyne Performance Formula Diesel Fuel Additive 2-Pack (2 x 1/2 gal) — Cleans Injectors, Restores Lubricity & Boosts Cetane

Stanadyne Performance Formula is a concentrated diesel fuel additive sold as two 1/2-gallon jugs that clean injection systems, improve combustion, and treat 500 gallons of diesel.

This two-pack of Stanadyne Performance Formula delivers proven detergency, cetane boost, lubricity restoration, and cold-weather protection in a ready-to-use package. Each 64 oz. jug treats 250 gallons of diesel, so the set treats up to 500 gallons total. The formula is compatible with ultra-low sulfur diesel and biodiesel blends up to B20 and was developed to protect modern fuel systems without harming exhaust aftertreatment devices.

How does this additive improve engine performance?

Stanadyne Performance Formula uses detergents and deposit modifiers to remove varnish and gum from injectors, pumps, and combustion chambers. Cleaner injectors deliver a finer spray pattern and more complete combustion, which translates to quicker acceleration, restored horsepower, and smoother operation.

• Detergents clean injector tips and nozzle holes for improved fuel atomization.
• Cetane improvers promote faster ignition for easier starts and crisper throttle response.
• Restored combustion can reduce engine noise and improve torque delivery.

Will this reduce my fuel consumption or emissions?

Yes—independent testing shows average fuel economy gains and measurable reductions in smoke and particulates. By improving combustion efficiency and restoring lubricity, the product can lower fuel use and help engines run cleaner without modifying operating practices.

• Average reported MPG improvement around 4%, with gains up to 9.6% in some cases.
• Cleaner combustion reduces visible smoke and particulate output.
• Lubricity additives help protect components, indirectly preserving efficiency over time.

Is this safe for modern diesel systems and cold weather use?

Stanadyne Performance Formula is formulated to meet contemporary fuel system requirements and is safe for engines equipped with exhaust aftertreatment systems. The additive also provides cold-flow benefits, improving pour point and cold filter plug point depending on the base fuel.

• No alcohol in the formulation, avoiding corrosion and accelerated wear.
• Cold flow improvements: pour point up to 40°F (22°C) better, cold filter plug point up to 25°F (13°C) depending on base fuel.
• Contains corrosion inhibitors and demulsifiers to protect components and aid water separation.

How do I use the two half-gallon jugs and what do they treat?

Each 64 oz. jug is premeasured to treat 250 gallons of diesel at the recommended dose; the pair covers 500 gallons total. Add the product directly to the fuel tank or storage tank before fueling where possible, and follow dosing instructions for best results.

• Two 1/2-gallon jugs (64 oz. each) — each jug treats 250 gallons of diesel.
• Total treatment capacity: 500 gallons from the two-pack.
• Suitable for on-road, off-road, and marine diesel applications as well as fuels up to B20 biodiesel blends.

Who this is for: Operators, fleet managers, boat owners, and diesel enthusiasts who want a product that combines injector detergency, cetane improvement, lubricity restoration, and cold-weather protection in one concentrated formula. If you maintain diesel engines—large or small—and want to protect fuel system components while improving combustion efficiency and drivability, this two-pack is designed to treat multiple tanks and prolonged service intervals without risking modern emissions hardware.