Years Later, Navistar Is Haunted by a Big Engine Blunder

ProStar truck Courtesy Navistar

For much of the past decade, Navistar International, the largest U.S. builder of school buses and long-haul freight trucks, bet on a diesel engine emission technology that none of its rivals had adopted. That decision proved disastrous: more than $700 million lost, the ouster of its chief executive, and costs that continue to this day.

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