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Graphic from Questar Auto Technologies showing a chart that links persistent diagnostic trouble code (DTC) activity with increased idle fuel consumption. The chart highlights periods of high-impact DTC events and elevated fuel use over time. Accompanying text states that aftertreatment issues can drive higher idle fuel consumption and contribute to excess fuel costs for fleets.
Newsby Lauren FletcherJune 11, 2026

Questar Analysis Finds Aftertreatment Degradation Can Cost Fleets Up to $30 Per Vehicle Per Day in Excess Fuel

Questar analysis found degraded DPF and SCR systems can waste up to $30 in fuel per vehicle daily, creating significant avoidable fleet operating costs.

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ProductsOctober 7, 2019

Flash Cleaner Extends Life for DPFs, DOCs

The Flash Cleaner Machine utilizes a combination of air, liquid, and thermal cleaning processes.

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ProductsSeptember 26, 2017

Diesel Exhaust Fluid

Shell Rotella's Diesel Exhaust Fluid has been designed for on-highway medium- and heavy-duty trucks as well as off-highway construction equipment and trucks.

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NewsJuly 15, 2014

Navistar First Vocational Trucks Ship with 9.0L, 10.L SCR Engines

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.

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NewsMarch 20, 2014

Navistar Adds SCR to DuraStar & WorkStar 9.0L, 10.0L Engines

Navistar, Inc. announced it will add selective catalytic reduction (SCR) emissions technology to its high horsepower mid-range engines starting this summer.

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Articlesby Sean LydenJanuary 2, 2014

The Latest Trends in Medium-Duty Truck Maintenance

How current and future challenges are affecting medium-duty fleets.

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NewsJuly 19, 2013

Navistar Introduces 13.0L SCR Heavy-Duty International WorkStar

Navistar, Inc. announced the launch of its heavy-duty International WorkStar vocational trucks powered by the company's 13.0L engine with selective catalytic reduction (SCR) emissions technology.

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NewsJuly 9, 2013

Chrysler Details Four New Engines and New Nine-Speed Transmission for Select 2014 Vehicles

For 2014, Chrysler Group said it will offer two “firsts” for the auto industry, a new nine-speed automatic transmission and a front-wheel-drive-based 4x4 system with rear-axle disconnect. In addition, the automaker is introducing four new engines, including two diesels.

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ProductsMarch 20, 2013

MaxxForce 13.0L with SCR

The MaxxForce 13 features the proven Cummins Emission Solutions after-treatment system and includes numerous improvements to the turbochargers, EGR valves, high and low temperature coolers and exhaust bellows.

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ArticlesNovember 1, 2012

Navistar Details Product Changes & Thinking Behind Emissions Strategy

With plans to gradually roll out its In-Cylinder Technology Plus (ICT+) throughout 2013, Navistar discusses how it will meet 2014 and 2017 emissions standards.

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