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Prestone Command Diesel Exhaust Fluid (DEF)

Prestone Command Diesel Exhaust Fluid (DEF)


Prestone Command™ Diesel Exhaust Fluid (DEF) is formulated with high quality urea and pure demineralized water to work with ALL Selective Catalytic Reduction (SCR)-equipped diesel engines.



  • Non-flammable
  • Non-toxic
  • Premixed with pure water
  • DEF is a consumable component of SCR equipped trucks. SCR allows the engine manufacture to tune the engine for increased fuel efficiency while remaining in compliance with Federal emissions requirements.

    Prestone Command™ DEF usage will vary by vehicle. Most OEMs claim usage will equal to 2%-3% of diesel fuel consumption. On average, this amounts to one gallon of DEF to every 50-75 gallons of fuel. Check owner’s manual for proper usage in your vehicle. DEF does not require special handling. DEF reacts with certain metals such as aluminum, copper and brass. Therefore, only place DEF in storage tanks and dispensing equipment made of stainless steel or high density polyethylene.

  • Prestone Command™ Diesel Exhaust Fluid (DEF) is a nontoxic solution of 67.5% water and 32.5% automotive grade urea. 

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