Navistar International brand International Truck , Lisle, Illinois, has announced the release of its Diamond Edge Certified Program, a collaborative effort between International Truck and its dealers to recognize dealers for their commitment to uptime and to drive awareness of the high-performing services offered to customers from dealers with this designation, the company says. "International Truck has an unrelenting passion for delivering on our mission of uptime," says Mark Reiter, vice president, customer support, Navistar.