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  1. DEF Tank Heater

    OK, very good news to hear. Thank you.

  2. DEF Tank Heater

    That is correct. DEF is a mixture of deionized water and urea. Websites of DEF report it has a freezing point of 12 degrees Farenheit.

  3. DEF Tank Heater

    Hello, Does anyone know for certain if the Jeep Wrangler Diesel DEF tank and the fluid line to the engine are both heated to prevent fluid freezing in the winter temperatures?


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