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Wednesday, February 4, 2026
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DEF

EPA Questions Need for Diesel DEF De-Rates

The Environmental Protection Agency is asking diesel engine makers to provide information about diesel exhaust fluid system failures as it considers changes to...

EPA Gives Engine Makers 30 Days to Provide DEF System Data

“Today, we are ... demanding detailed data to hold manufacturers accountable," EPA Administrator Lee...

EPA to Curb DEF Shutdowns in New and Existing Trucks

American Trucking Associations praised the move. (John Sommers II for Transport Topics) ...

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