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.