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U.S. retail diesel prices dipped for the sixth straight week as the national average declined 2.4 cents to $2.748 a gallon, the Department of Energy reported.

Biodiesel producers are threatening to shut down their operations if the Senate does not approve a bill that would extend the $1 per gallon biodiesel tax credit due to expire on Dec. 31.

Biodiesel producers are threatening to shut down their operations if the Senate does not approve a bill that would extend the $1 per gallon biodiesel tax credit due to expire Dec. 31.

Beginning Jan. 1, officials at the Southern California sister ports of Los Angeles and Long Beach will face yet another challenge as they begin the second phase of their clean trucks plans: fewer trucks.

Today’s new diesel-power trucks are, by law, equipped with particulate filters, and in many models the DPF will soon will be joined by another aftertreatment device — selective catalytic reduction, or SCR, in a canister.

Commercial vehicle Group said it will close its Norwalk, Ohio, truck cab plant due to Navistar Inc.'s decision to assemble cabs for its own trucks.

Donaldson Co., a manufacturer of filtration systems, said Monday it is spending $5 million to enable one of its plants to manufacture parts that comply with the Environmental Protection Agency’s 2010 diesel emission standards.

The U.S. Environmental Protection Agency last week declared that greenhouse gas emissions from vehicles and industrial facilities are a danger to human health, a first step the agency must take along the path to regulations limiting the levels of combustion by-products from tailpipes.