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Tuesday, July 14, 2026

EPA Proposes Changes to Diesel Engine Rules

The Environmental Protection Agency is proposing changes to diesel engine rules it says could save the trucking industry $12 billion, while lowering transportation costs for farmers and rural businesses. If approved, the proposal would eliminate engine deratements caused by Diesel Exhaust Fluid system failures and revise emissions warranty requirements. EPA estimates the changes could save up to $6,000 on the purchase of a new truck while maintaining most nitrogen oxide emissions reductions. EPA Administrator Lee Zeldin says the plan will make trucks more reliable while reducing costs for operators. Agriculture Secretary Brooke Rollins welcomed the proposal, saying, "Administrator Zeldin is continuing to deliver for our nation's farmers, ranchers, and truckers. This proposal to eliminate engine deratements and reform the Biden-era DEF requirements will lower costs, increase safety, and keep our nation's food supply moving." EPA is also proposing additional time for manufacturers to comply with certain emissions requirements.