Tested in a tunnel, proven on the road.
Extensive wind tunnel testing enabled our engineers and designers to create a sleek, modern chassis with bold aerodynamics that help deliver maximum fuel efficiency in all conditions and at any speed. Nothing escaped scrutiny.
- Redesigned hood and door mirrors for enhanced aerodynamics
- Full chassis fairings featuring enhanced flexible side skirts
- Reshaped front wheel well closeouts
- 24” side extenders
- Optimized low ground clearance bumper
- Optimized drive wheel fairings
- Extended roof spoiler
- Aerodynamic height control
- Michelin X Line Energy D+ Tires
Two-piece painted bumper with integrated air ducts improves aerodynamics.
Optimized drive wheel fairings and FlowBelow wheel covers reduce drag and improved fuel economy.
Chassis side fairings with black flexible skirts improve aerodynamics while shielding tanks and batteries from the elements.
24" side extenders with black flexible ends offering greater aerodynamics and longer life.
All the lighting on the 57X is LED, providing bright light with reduced maintenance and downtime for replacement.
DETROIT DD13 GEN 5
The DD13 Gen 5 engine offers the best of the best in cutting-edge diesel engine technology and engineering. It's been significantly redesigned with drivers in mind, with numerous innovations to increase performance, durability and productivity.
DETROIT DD15 GEN 5
Backed by years of proven performance, the new Detroit DD15 Gen 5 takes reliability, durability and productivity to the next level. Perfect for any operation, vocational or on-highway, the DD15 delivers everything you need from an engine, including greater profitability.
The biggest, toughest and most powerful engine Detroit has ever produced, the DD16® is the only 16-liter engine available. And since it offers the longest service intervals in the industry, it tackles your hardest jobs while increasing uptime and profitability.
The latest and greatest highway truck from Western Star deserves the latest and greatest powertrain options from our partners, and that starts with Detroit. From the new Gen 5 versions of the Detroit® DD13® and DD15® engines, to the proven DD16®, to the newest DT12® automated manual transmission, you’ll have the power you can count on.
The Integrated Detroit® Powertrain is the most fuel-efficient combination of Detroit® components available. Designed to work together to deliver maximum performance and lower operational costs, its list of advanced features include Intelligent Powertrain Management (IPM6) - the next level of predictive technology with the Detroit® DT12® transmission - and the innovative Axle Lubrication Management (ALM) system.
Detroit has taken the long-proven DT12 automated manual transmission and made it even better. Now you can spec your DT12 as direct-drive or overdrive, and even add a PTO for those highway applications that need one.
Automated Manual Transmission
Automated Manual Transmission