Stanadyne Performance Formula Diesel Fuel Additive — 12 × 1/2 pt Pack, Injector Cleaner & Cold-Weather Protection

Stanadyne Performance Formula is a concentrated diesel fuel treatment designed to restore engine power, protect fuel systems, and improve cold-weather reliability when dosed regularly.

Designed for diesel engines in trucks, tractors, generators and commercial fleets, this 12-pack of 1/2 pint bottles (part #38564) provides measured doses for routine maintenance and seasonal protection. The formula cleans injectors and combustion chambers, adds lubricity for low-sulfur fuels, and contains cold-weather components to reduce gelling in winter blends. Use it with every fill-up for general performance or periodically as an injector cleaner to recover lost horsepower and efficiency.

How does Stanadyne Performance Formula improve engine performance?

This additive targets deposits and friction in the fuel system to recover lost horsepower and smoother throttle response. It contains detergents and lubricity agents to clean injectors and protect high-pressure fuel pumps from wear.

• Removes carbon and varnish from injectors and combustion chambers
• Restores fuel spray patterns for more complete combustion
• Lubricates moving parts in pumps and injectors to reduce wear

Will it help in cold weather or with winterized fuels?

Yes — the Performance Formula includes cold-weather protection to reduce fuel gelling and improve flow in lower temperatures. For severe cold, Stanadyne also offers specific cold-weather blends; this formula provides broad protection for typical winter conditions.

• Anti-gel components to keep fuel flowing in cooler climates
• Compatible with ULSD and common winter blends including B20
• Helps prevent filter plugging from wax crystallization

How often should I use it and how is it dosed?

For everyday maintenance, add the recommended dose with each tank fill to maintain peak performance and protection. Use the injector-cleaner dosing schedule (typically 4–6 times per year) for intensive deposit removal and restoration of lost power.

• Use one 1/2 pint bottle per specified tank size as directed on the label
• Regular dosing at each fill keeps lubricity and cleanliness consistent
• Periodic heavy dosing cycles refresh injectors and combustion efficiency

Is this safe for modern emission systems and biodiesel blends?

Stanadyne Performance Formula is formulated to be exhaust-aftertreatment safe and compatible with ultra-low sulfur diesel (ULSD) and up to B20 biodiesel blends. It also contains corrosion inhibitors to protect fuel system components from degradation.

• Marked exhaust aftertreatment safe for DPF and catalyst-equipped engines
• Compatible with ULSD and up to 20% biodiesel (B20)
• Includes corrosion prevention to safeguard metal fuel system parts

Who this product is for: fleet managers, pickup and heavy-equipment owners, agricultural operators, and anyone running diesel-powered generators who want a practical, dose-controlled way to maintain fuel system cleanliness, restore lost power, and reduce cold-weather issues. The 12-pack of 1/2 pint bottles is ideal for service crews, seasonal top-ups, or multiple vehicles, offering convenient single-use dosing to avoid over- or under-treatment.