DENTON, Texas – Peterbilt Motors Company announced today that the Cummins Westport ISL-G Near Zero NOx emissions natural gas engine will be available on Models 567, 520 and 320.

The ISL-G Near Zero engine emissions are 90% lower than the current EPA NOx limit through the introduction of a unique three way catalyst in the after-treatment, advanced engine calibration and a closed crankcase ventilation system (CCV), according to Cummins and Peterbilt. The new ISL-G Near Zero can also run on renewable natural gas (RNG). 

“Peterbilt is producing increasingly efficient products,” said Scott Newhouse, Peterbilt chief engineer. “The addition of the ISL-G Near Zero emissions engine strengthens Peterbilt as an environmental leader.”

The company says the new engine’s performance and efficiency will match the current ISL-G, with 320 horsepower and 1,000 lb-ft torque available.

“Peterbilt continues to lead the industry with the highest performing trucks on the road,” said Robert Woodall, Peterbilt assistant general manager of sales and marketing. “We’re pleased to offer the ISL-G Near Zero engine as an excellent choice for our customers.”

Peterbilt added that the Near Zero emissions engine will become available for production in Models 520 and 320 by year-end and in the Model 567 in early 2017.