ACDelco DEF Diesel Exhaust Fluid 2.5 gal x2 — Gold ISO 22241 Purity, Vented Pour Nozzles

ACDelco Gold 10-4023 (19286292) Diesel Exhaust Fluid is a high-purity urea solution in two 2.5-gallon containers formulated to help SCR-equipped diesel engines reduce NOx emissions.

This ACDelco DEF combines laboratory-grade synthetic urea and deionized water into a clear, stable fluid designed to meet ISO 22241 purity and concentration standards. It is non-flammable, non-toxic, and free of aldehydes and additives that could disrupt selective catalytic reduction (SCR) systems. Packaged as two 2.5-gallon jugs with vented pour nozzles, this set is suitable for fleet vehicles and consumer diesel trucks that require DEF meeting GM OE and API guidelines.

How does this DEF support NOx reduction in diesel vehicles?

When introduced into the exhaust stream of SCR-equipped diesel engines, high-purity DEF helps convert nitrogen oxides (NOx) into nitrogen and water vapor, supporting regulatory emissions targets without modifying engine performance. ACDelco’s formula focuses on purity to avoid deposits or catalyst interference.

• Meets ISO 22241 purity and concentration specifications.
• Formulated from synthetic urea and deionized water only — no additives.
• Compatible with SCR systems designed to reduce NOx in diesel exhaust.
• Complies with API standards and GM original equipment expectations.

Is this DEF safe to store and handle?

ACDelco DEF is classified as minimum-risk for transport and is non-flammable and non-toxic under normal use. The product ships in durable containers with vented pour nozzles to reduce spills and glugging, and one complimentary nozzle is included for immediate use.

• Stable, colorless solution that resists degradation when stored properly.
• Vented nozzles help controlled pouring and minimize splash-back.
• One free nozzle provided; additional nozzles available separately.
• Follow storage recommendations: cool, dry place away from direct sunlight.

How do I know this DEF will work with my vehicle?

If your diesel vehicle uses a Selective Catalytic Reduction (SCR) system, this ACDelco DEF is formulated to meet the same GM OE specifications required by many manufacturers. Because it adheres to international ISO standards and API recommendations, it’s suitable for GM vehicles and most other diesel models that call for ISO-compliant DEF.

• Approved for use in GM vehicles requiring OEM-spec DEF.
• Safe for non-GM diesel vehicles equipped with SCR systems that require ISO-grade DEF.
• Check your owner’s manual for DEF concentration and refill intervals.
• Using off-spec fluids can lead to SCR malfunction; choose ISO 22241-compliant products.

How should I store and pour the DEF to avoid contamination?

Keep containers tightly sealed when not in use and store them between recommended temperatures to preserve concentration and prevent freeze-thaw damage. Use the vented pour nozzle to transfer DEF into your vehicle’s tank and avoid cross-contamination with fuels or other fluids.

• Store in original jug, upright, sealed, in a cool, shaded place.
• Avoid contact with oils, fuels, or chemical additives that can contaminate DEF.
• Use the included vented nozzle to reduce spills and glugging during refills.
• If DEF freezes, thaw slowly at room temperature before use; do not agitate aggressively.

Who is this for: Automotive technicians, fleet managers, and diesel owners who need a reliable, OEM-grade DEF supply for SCR-equipped vehicles will find the ACDelco Gold 10-4023 two-pack practical and cost-effective. It’s best for users who require ISO 22241-compliant fluid, want vented nozzles for easier pouring, and prefer DEF that meets GM and API specifications for consistent, contamination-free performance.