EGR-only engines put up to six pounds of soot into oil during a 40,000-mile interval.
Navistar will move from EGR and adopt the SCR path taken by its competitors to meet 2010 diesel emissions regulations.
Company has permission to continue to sell new heavy-duty truck engines as long as the company still has enough emissions credits.
California Air Resources Board had issued a public letter to Navistar saying the company's emissions credits for the engine will expire Feb. 29.
Company sought to force the U.S. Environmental Protection Agency to recall 2010 model year engines using selective catalytic reduction.
New engine technology promises not only improved engine efficiency, but also the ability to spec your drivetrain to further enhance fuel economy.
Navistar alleges nitrogen oxide emissions skyrocket when drivers don't keep diesel exhaust fluid topped off.
Navistar is the only heavy-duty engine maker using exhaust gas recirculation without selective catalytic reduction to meet federal emissions regulations.
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