Navistar alleges nitrogen oxide emissions skyrocket when drivers don't keep diesel exhaust fluid topped off.
Agency calls on SCR engine makers to develop warning systems that alert drivers when diesel exhaust fluid tank is nearly empty.
Navistar’s MaxxForce Big Bore’s non-SCR approach to 2010 emissions offers strong fuel economy and performance.
Company is achieving a 6 percent improvement in fuel economy in its 2010 engine compared with 2007 technology.
Manufacturers say EPA-driven changes yield better fuel economy and other benefits.
Shell is touring eight U.S. cities through Oct. 28 to educate fleet owners and maintenance managers about products and services.
The EPA and the California Air Resources Board have presented preliminary proposals aimed at alleged compliance loopholes noted by Navistar.
The agreements include two companies – Barjan and DAS – that distribute goods to truck stops and travel centers.
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