Description
Product Overview
Stanadyne’s diesel additive, model add38565, is a specially formulated concentrate designed for modern ultra low sulfur diesel (ULSD) engines. Packaged in an 11 × 9 × 10 inch container weighing just 0.01 oz, the formula combines powerful demulsifiers, cetane improvers, and lubricity enhancers. The demulsifiers break the emulsion of water droplets that can form in fuel, allowing the fuel filter to remove moisture more effectively. Cetane boosters raise the fuel’s cetane number, resulting in smoother combustion, quicker starts, and reduced engine knock. Lubricity additives restore the natural lubricating properties lost during the desulfurization process, protecting high‑pressure fuel pumps and injectors. The product meets ASTM standards for diesel additives and is approved for use with biodiesel blends up to B20, making it versatile for a wide range of diesel applications.
Usage
Designed for both on‑road and off‑road diesel engines, this additive is ideal for light‑duty trucks, heavy‑duty commercial fleets, agricultural equipment, and marine diesel engines. Users simply add the recommended dose to a clean fuel tank before the first fill of the season or during routine maintenance. The additive works continuously, keeping the fuel system free of water, deposits, and wear‑inducing particles throughout the operating cycle. It is especially beneficial in cold climates where fuel gelling and water condensation are common, as the demulsifier action helps prevent fuel line freeze‑up. 
Why Choose Us
Stanadyne brings over a century of diesel expertise to every bottle. The company’s research labs test each batch against rigorous performance criteria, ensuring consistent cetane improvement and deposit removal. Unlike generic additives, Stanadyne’s formula is calibrated for ULSD and biodiesel blends, guaranteeing that lubricity is restored without compromising fuel filter integrity. The product carries a 4.8‑star rating from over 800 verified customers, reflecting real‑world reliability and measurable fuel‑economy gains. With a proven track record in the automotive market—ranked #41 in Diesel Additives on Amazon—buyers receive a trusted solution backed by a reputable manufacturer.
Key Features
- Boosts horsepower by cleaning injection system deposits and improving combustion efficiency.
- Improves fuel economy by up to 9.6% through reduced friction and optimized cetane levels.
- Restores lubricity lost in ultra low sulfur diesel, protecting high‑pressure fuel components.
- Reduces smoke, particulates and overall emissions for cleaner operation.
- Compatible with biodiesel blends up to B20, offering flexibility for alternative fuel use.
FAQ
How often should I add the Stanadyne diesel additive?
For most diesel engines, adding the additive at each fuel fill or at least once every 1,000 miles ensures continuous protection. In severe conditions—such as extreme cold or high‑water environments—more frequent dosing (every 500 miles) is recommended.
Will this additive void my engine warranty?
No. Stanadyne diesel additive meets OEM specifications and is approved for use in engines that require ULSD. It is formulated to complement, not replace, manufacturer‑recommended maintenance practices.
Can I use this product with diesel exhaust fluid (DEF)?
Yes. The additive is added to the fuel tank, while DEF is injected into the exhaust system separately. They operate independently and do not interfere with each other.
Is the additive safe for marine diesel engines?
Absolutely. The formula is marine‑grade and has been tested in marine diesel applications, providing the same deposit‑removing and lubricity benefits without harming marine fuel systems.
What is the recommended dosage for a 15‑gallon fuel tank?
Typically, one ounce of additive per 15 gallons of fuel is sufficient. Always refer to the product label for exact dosing instructions based on engine size and operating conditions.
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