Prime Guard ULTRAPURE Diesel Exhaust Fluid (DEF) 1 Gallon – API Certified, ISO 22241 Compliant

This one-gallon container of Prime Guard ULTRAPURE Diesel Exhaust Fluid (DEF) provides a high-purity urea solution designed for Selective Catalytic Reduction (SCR) systems. It meets major industry standards and carries API certification to ensure suitability with modern diesel exhaust aftertreatment systems. The product is formaldehyde-free and manufactured to maintain the concentration and cleanliness essential for reliable SCR operation.

How does Prime Guard DEF support my vehicle's emission system?

Prime Guard DEF supplies a precisely blended urea solution that SCR systems convert into ammonia to reduce nitrogen oxides (NOx) in the exhaust stream. Using DEF that meets ISO and related standards reduces the risk of deposits and system faults, helping the aftertreatment components function as intended.

• Meets ISO 22241, AUS 32 and DIN 70070 purity and concentration requirements
• API certified for compatibility with modern SCR systems
• Formaldehyde-free formulation to protect SCR components

Will Prime Guard DEF affect my fuel economy or maintenance needs?

DEF itself does not fuel the engine but supports emissions control, which can prevent increased backpressure or component wear from improper aftertreatment operation. Regular use of ULTRAPURE DEF reduces the likelihood of injector and catalyst issues tied to contaminated or off-spec fluids.

• Helps maintain SCR efficiency, indirectly supporting engine performance
• Reduces risk of costly aftertreatment repairs caused by low-quality fluids
• Consistent concentration minimizes unexpected regeneration or warning events

How should I store and handle this one-gallon DEF container?

Keep the container sealed and stored in a cool, dry place away from direct sunlight to preserve quality and prevent contamination. Avoid extreme temperatures; if DEF freezes, allow it to return to liquid form slowly before use—freezing does not damage the product but may temporarily prevent pouring.

• Store upright, sealed, in temperatures recommended by the manufacturer
• Use the included dispensing nozzle on larger packs when available for spill-free pouring
• Replace caps promptly after use to maintain purity

What standards and certifications does Prime Guard DEF meet?

This DEF is manufactured to comply with internationally recognized standards for diesel exhaust fluids, ensuring correct urea concentration and low impurity levels. That compliance signals compatibility with OEM requirements and helps avoid warranty or servicing issues tied to substandard fluids.

• Conforms to ISO 22241 concentration and purity standards
• Complies with AUS 32 and DIN 70070 specifications
• API certified to confirm quality and SCR suitability

Who is this for: Prime Guard PRIM00203 DEF 1 Gallon is aimed at drivers, fleets and technicians operating diesel vehicles equipped with SCR systems who want a single-gallon supply of ULTRAPURE DEF. It’s suitable for light- and heavy-duty trucks, vans, agricultural and construction equipment that require compliant DEF to maintain emission control performance and avoid aftertreatment issues. Choose this DEF when you need a verified, standards-compliant fluid in a convenient one-gallon size for topping off or on-the-go refills.