Navistar Inc reportedly has received certification from the US Environmental Protection Agency (EPA) for its proprietary 13-liter heavy-duty big bore engines with selective catalytic reduction (SCR) emissions technology. Navistar's proprietary 13-liter engine is certified by EPA at or below the required 0.20 g/bhp-hr NOx.

"EPA certification of our proprietary 13-liter engine with SCR completes our transition to SCR-based technology for our heavy-duty engines," says Jack Allen, Navistar executive vice-president and chief operating officer. "We've reached another milestone in our emissions strategy transition and are on track to deliver our first ProStar units with our SCR-based 13-liter engines at the end of April."

Navistar introduced its first SCR-based commercial trucks for the US and Canadian markets in December 2012 with the launch of the International ProStar with the Cummins ISX 15-liter engine. With the introduction of the ProStar equipped with the company's proprietary 13-liter with SCR, International now offers a complete line-up of clean engine SCR-based product offerings for the Class 8 on-highway market.