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  1. Diesel exhaust fluid - Wikipedia

    Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue[3]) is a liquid used to reduce the amount of air pollution created by a diesel engine. Specifically, DEF …

  2. DEF Definition & Meaning - Merriam-Webster

    What does the abbreviation DEF stand for? Meaning: defendant; defense. How to use def in a sentence.

  3. 20 Facts You Need To Know About Diesel Exhaust Fluid (DEF)

    What exactly is Diesel Exhaust Fluid (DEF)? From a strictly chemical disposition DEF is a mixture of 67.5% deionized water and 32.5% urea. Urea is a compound in Nitrogen that turns to …

  4. DEF Definition & Meaning | Dictionary.com

    Def definition: definitely.. See examples of DEF used in a sentence.

  5. Diesel Exhaust Fluid - Shop DEF Fluid - AutoZone

    Reduce emissions and keep your diesel vehicle running clean with diesel exhaust fluid (DEF) from AutoZone. We sell the best brands, including AutoZone, Lumax, and Peak Blue DEF fluid. We …

  6. What Exactly Is DEF & What Does The Acronym Stand For?

    Apr 19, 2025 · The letters DEF stand for diesel exhaust fluid. Sometimes, you'll hear people refer to it as DEF fluid, and all three formats are acceptable. If you're interested in learning more …

  7. What Is DEF and How Does It Work? - MotorTrend

    Jul 29, 2024 · DEF is a key component in lowering pollutants emitted from diesel engines, helping to reduce harmful emissions. Long-haul truckers and diesel engine enthusiasts had to rethink …

  8. DEF definition and meaning | Collins English Dictionary

    8 meanings: slang very good, esp of hip-hop definition → 1. a formal and concise statement of the meaning of a word, phrase,....

  9. DEF: Is There A Difference In The Brands You Find On The Shelf

    Apr 17, 2023 · DEF is made up of 67.5 percent deionized water and 32.5 percent high-purity urea. A quick internet search tells us there are roughly 100 American Petroleum Institute (API) …

  10. NAPA Diesel Exhaust Fluid (DEF) - 2.5 gal - NAPA Auto Parts

    Buy NAPA Diesel Exhaust Fluid (DEF) - 2.5 gal - NAF NPF002 online from NAPA Auto Parts Stores. Get deals on automotive parts, truck parts and more.

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