Navistar is accusing the U.S. Environmental Protection Agency (EPA) of having certified competitors’ exhaust emission systems without determining if those systems work as intended under certain real-world situations, according to a lawsuit filed July 5 in the U.S. District Court for the District of Columbia.
The suit states that SCR-equipped engines - used by Navistar’s competitors to meet EPA-2010 emissions standards—require frequent replenishment with an essential fluid [DEF a.k.a. urea] and … “Those fill-ups are both expensive and inconvenient for the customers of SCR engine makers.” The suit also contends that whenever the DEF tank is empty, emissions rise “3 to 40 times.”