Navistar, Inc. started customer shipments of its first International DuraStar and International WorkStar vehicles with the company’s 9.0L and 10.0L engines with selective catalytic reduction (SCR) emissions technology. The company’s internal testing shows these products are delivering up to 8 percent in fuel-economy improvement over the previous generation.

“Our field test customers are seeing positive results – with our new trucks registering significant fuel economy improvements,” said Bill Kozek, president, North America Truck and Parts, Navistar. “Our vocational trucks with  9.0L and 10.0Lr engines are also experiencing fewer active regenerations while still delivering the durability and power that customers expect from International trucks.”

Built on Navistar’s proven I-6 platform, the company’s  9.0L and 10.0L engines bring 9.3-liter displacement and 860-1,150 lb.-ft. torque in a weight-saving medium-duty package. The company conducted field tests in extreme environments such as Alaska, Colorado, and Arizona. These tests included a variety of vocational duty cycles from garbage packing and utility trucks to dump trucks and sewer pumpers.

The International DuraStar is available with the 9.0L engine from 275 hp 860 lb.-ft torque up to 330 hp 950 lb.-ft torque. The International WorkStar is available with  9.0L and 10.0L engines from 275 hp 860 lb.-ft torque up to 350 hp 1,150 lb.-ft torque. All International vocational trucks feature the International Diamond Logic electrical system.