Natural Gas – Conversions, Vehicles and Technology

Peterbilt Offers Cummins Near-Zero Emissions Natural Gas Engine

August 30, 2016

Photo: Cummins Westport
Photo: Cummins Westport

Peterbilt Motors is offering the Cummins Westport ISL G Near Zero NOx emissions natural gas engine for its Model 567, 520, and 320 trucks.

The new engine’s performance and efficiency matches the current ISL G with 320 horsepower and 1,000 lb.-ft. of torque available. The engine option is aimed at customers with linehaul, vocational, and refuse applications.

The ISL G Near Zero engine’s emissions are 90% lower than the current EPA NOx limit, made possible with a three-way catalyst in the aftertreatment, advanced engine calibration and a closed crankcase ventilation system.

Like the current ISL G engine, the new model will operate on 100% natural gas, which can be carried on the vehicle in either compressed or liquefied form. The ISL-G Near Zero can also run on renewable natural gas.

The ISL G NZ is the first mid-range engine to meet the 0.02 g/bhp-hr optional Near Zero NOx Emissions standards for medium-duty truck, urban bus, school bus, and refuse applications, according to Cummins Westport. It meets California Air Resources Board certification eight years in advance of the 2023 California Near Zero NOx schedule.

The engine will be available for production in Models 520 and 320 by year's end and in the Model 567 early next year.


  1. 1. ward winburn [ September 12, 2016 @ 03:02PM ]

    There is a way for near zero emissions using current engines.


Comment On This Story

Comment: (Maximum 10000 characters)  
Leave this field empty:
* Please note that every comment is moderated.

Article News

Popular Stories


Fleet Management And Leasing

Jack Firriolo from Merchants will answer your questions and challenges

View All


Public Fleet Tracking And Telematics

Amin Amini from Verizon Connect will answer your questions and challenges

View All


Fuel Management

Bernie Kanavagh from WEX will answer your questions and challenges

View All


Recent Topics

I am looking for a used bucket truck for around $50k for our traffic division. The only stringent requirement is the 50' bucket work...

View Topic

How many different types of antifreeze do you stock? I’m curious to know what others are doing to deal with the numerous specifications...

View Topic

Fleet Documents

1126 Fleet Documents (and counting) to Download!

Sponsored by

Terminology used in the United States and Canada to denote a financing type lease which is required to be "capitalized," i.e., the leased equipment must be recorded on the Lessee's balance sheet as assets with corresponding liabilities.

Read more