LISLE, Ill. — Ten-thousand orders have been placed for the International ProStar with Cummins’ ISX, Navistar announced today in what its calling a “major milestone.”

It was only seven months ago that Navistar and Cummins announced they were pairing the ProStar with the Cummins ISX15 engine and Cummins SCR aftertreatment system.

“The International ProStar with ISX has a strong reputation within the industry and we are seeing increased interest for this configuration across our key segments,” Bill Kozek, president, North American Truck and Parts, Navistar, commented. “We brought Cummins ISX back for a reason — our customers demanded a capable and efficient 15-liter solution within our International ProStar chassis, and this milestone along with the number of repeat orders, is a testament to customer acceptance.”

Navistar also dropped the Cummins engine into the PayStar 5900 Set-Back Axle and the International 9900i in April of this year.

Navistar said that it has received orders from Knight, Penske, Ryder and Swift. “Increasing acceptance from our large fleet customers who conduct rigorous analysis prior to purchase is evidence of the value our vehicles deliver,” Kozek said.

In July, the company reported on-highway class 8 order share at its highest level in three years.

Navistar began making the move to SCR-based technology with the Cummins ISX15 engine in late December 2012. The majority of configuration options for SCR-powered International heavy-duty vehicle models are nearing completion throughout the month of August, the company noted.