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Diesel Exhaust Fluid | ACDelco

Specifically designed for diesel engines, ACDelco Diesel Exhaust Fluid (DEF) is an aldehyde free, NOx (Nitrous Oxide)-reducing treatment. ACDelco Diesel Exhaust Fluid is a stable, colorless, non-flammable, non-toxic primary component used to help convert NOx, an environmental pollutant, into harmless nitrogen and water. This product is a mixture of high-purity synthetic urea and deionized water and is classified as minimum risk for transportation. ACDelco Diesel Exhaust Fluid meets the stringent ISO 22241 standard for purity and concentration, meets API regulations and meets or exceeds GM OE specifications.


  • Meets GM OE specifications to be approved for use in GM vehicles as well as in non-GM diesel vehicles that have an SCR system to meet regulated NOx emissions.
  • High-quality formula is made from high-purity urea and deionized water. It contains no chemical additives or other components that could cause SCR (Selective Catalytic Reduction) system failure.
  • Includes a vented nozzle with 1-gallon and 2.5-gallon packages that makes pouring easy by helping to prevent glugging.
  • 1 gallon 4 pack. Part No. 10-4022
  • 2.5 gallon 2 pack. Part No. 10-4023
  • 55 gallon drum. Part No. 10-4026
  • 330 gallon drum. Part No. 10-4027

Signs of Wear & Troubleshooting:

  • If your vehicle engine shuts down shortly after refilling the DEF tank, it could be a sign that DEF was added into the diesel fuel tank.
  • In this case, the vehicle must be taken immediately to a qualified service provider for repairs.
  • Follow the dashboard display warning of low diesel exhaust fluid to know when to add more.
  • Failure to do so could result in very low, limited available speed from the vehicle’s engine before the addition of a minimum amount of Diesel Exhaust Fluid.
  • Like water, Diesel Exhaust Fluid will freeze and expand at 12 degrees Fahrenheit/-11 degrees Celsius. To prevent damage from freezing, do not fill the reservoir more than recommended and do not store fluid outdoors or in a garage if freezing temperatures are expected.

Good Maintenance Practices:

  • Fill DEF in designated DEF tank.
  • Keep DEF dispensing equipment clean and free from dust or dirt.
  • Use only dedicated DEF equipment when handling/dispensing DEF.
  • Do not fill DEF into diesel fuel tank.
  • Do not fill diesel fuel into DEF tank.
  • Do not add water to DEF.
  • Store below 68 degrees Fahrenheit/20 degrees Celsius, protect against direct sunlight and use or store only as directed.
  • Rinse or wipe away any DEF that spills on vehicle components


Can NOx harm the environment?

  • Yes, nitrous oxides (NOx) are byproducts of combustion that can lead to the generation of atmospheric smog when in high enough concentrations.


Is it required by law to use diesel exhaust fluid with my diesel engine?

  • No, though diesel exhaust fluid is currently one of the most popular methods for controlling diesel exhaust pollutants. 
  • Diesel exhaust fluid must be used for those vehicles that are manufactured with Selective Catalytic Reduction technology.


Do I mix diesel exhaust fluid with my engine oil or other engine components?

  • No, diesel exhaust fluid must never be mixed with any other fluid. It must never be diluted with water.


Is there a way to check if ACDelco Diesel Exhaust Fluid is recommended for my vehicle?

  • Yes. Though ACDelco DEF meets all OEM quality standards for vehicles using Selective Catalytic Reduction technology, check your Owner's Manual to confirm that you require DEF for your vehicle.


Do I need to change my diesel exhaust fluid?

  • No, diesel exhaust fluid is never changed; it is burned just like diesel fuel. The DEF tank will need to be refilled at approximately the same frequency as an oil change.


Do all diesel engines require the same amount of DEF?

  • No, diesel exhaust fluid usage varies by driving style, fuel mileage and miles driven. Be prepared to refill the tank when the 1000-mile warning is displayed.


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