The first International ProStar tractors with EPA-certified MaxxForce 13L engines and SCR aftertreatment have been shipped, Navistar said.

The company added that the units are being shipped ahead of schedule. The first units began shipping last Friday, April 26, from truck manufacturing plants in Escobedo, Mexico, and Springfield, OH.

“Delivering our 13L engine ahead of schedule is another important milestone for Navistar and completes our transition to SCR-based heavy-duty engine offerings,” said Troy Clarke, Navistar president and chief executive officer. “We continue to receive great customer feedback on the refined 13-liter engines we're delivering today. And, customers will continue to see outstanding levels of quality, reliability and uptime with our 13L engine combined with the proven Cummins SCR aftertreatment system.”

The first International ProStar with SCR was shipped in December 2012. Those units included Cummins ISX 15L engines.