Navistar sues EPA for "unlawful and preferential" support for SCR technology

Christopher Goodfellow - 17 July 2011

Engine and vehicle manufacturer Navistar filed a new lawsuit against the Environmental Protection Agency (EPA) on July 5, accusing the agency of certifying its competitors' Selective Catalytic Reduction (SCR) equipped vehicles without determining whether they would work as intended in real-world conditions.

Navistar is the only heavy-duty vehicle manufacturer not to use SCR to meet the EPA 2010 legislation.

According to FleetOwner magazine, the suit states: "[The] EPA unlawfully and preferentially helped (and intends to continue to help) SCR engine manufacturers by making it easier for them to compete with other emission control technologies by reducing or eliminating the need for drivers to refill with DEF [Diesel Exhaust Fluid], which in turn allows SCR engines to become heavy polluters above the lawful emission standards."

Navistar has previously sued the EPA, claiming that its policy allowed SCR-equipped trucks to run for extended periods without any control of NOx emissions. Navistar agreed to drop the case in May 2010, which the EPA agreed to hold public workshops to discuss the implementation of SCR legislation.

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