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Born from the driver’s need for increased efficiency, safety, and comfort. Purpose-built to redefine what a highway truck should be.

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Introducing the 57X, the newest member of the Western Star X-Series family and the most advanced and driver-focused highway truck we’ve ever built.


Built on a history of toughness and equipped with technology, comfort, safety and efficiency that rewards you every time you get behind the wheel and when you check your bottom line.




The Most Driver-Focused Truck On The Road

Making life easier for those who drive our trucks is always high on the priority list, so we’ve taken cab life a serious leap forward. It begins with our new digital dash display: bright, clear, customizable and intuitive. Then there’s the driver’s lounge in back. Equally as customizable, it’s easily spec’d out with optional features including a flat-screen TV, refrigerator, dinette, a full-size Murphy-style bed and more.

View Cab Details >

Efficiency (Aerodynamics and Powertrain)

Advanced Aerodynamics And Greater Fuel Efficiency

We’ve pushed the laws of aerodynamics to the max and these advancements, coupled with the latest powertrain technologies, have come together seamlessly to deliver the most fuel-efficient highway truck we’ve ever made.

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Digital Dash

Created To Make Driving Easier

A 12" A-panel display and 10" B-panel display provides access to all the data and entertainment you need, without your hands ever leaving the wheel.


More Data Means More Uptime

Our X-Series trucks represent a big advancement in productivity for Western Star trucks thanks to Detroit Connect®. Detroit Connect translates the performance data of any type of truck into real-time information you can use to make decisions that can help you keep those trucks on the road and earning.

Learn More About Detroit Connect >


Engineered To Perform

The 57X rides on a durable Daimler corporate chassis, backed by millions of miles of proven performance.


Engineered For The Long Haul

Steel-reinforced aluminum with internally mounted hinges for greater durability and no sagging.


Form And Function Working Together

Our C-Bar Mirror System was created for maximum stability and aerodynamics to help your drivers and your bottom line.



Safety and technology as advanced as its design.

See Detroit Assurance in Action.

From anticipating traffic slowdowns to protecting blind spots to keeping trucks in their lanes, Detroit Assurance® Suite of Safety Systems has the technology to help improve safety and uptime.

State-of-the-Art Safety from Detroit

The 57X comes equipped with the entire Detroit Assurance® Suite of Safety Systems, the most advanced safety technology in the industry. The suite features a number of safety-improving technologies, which you can learn more about right here.

Learn more about
Detroit Assurance
Active Brake Assist 5

Active Brake Assist 5 detects distance and speed to moving and stationary objects in its path and determines if braking is necessary. It’s the only system on the market that works down to 5 MPH*, making it ideal for travel in congested urban areas. It also recognizes pedestrians who are about to cross in the truck’s path, alerting the operator while partially braking, followed by full braking if the operator does not react.

*with Detroit® DT12® transmission

Adaptive Cruise Control To 0 MPH And Tailgate Warning

Detroit Assurance technology enables state-of-the-art features such as Adaptive Cruise Control to 0 MPH to ease driving in stop-and-go traffic, as well as help mitigate front and rear collisions.

Brake Hold Mode

Whether stopped in heavy traffic or for any other reason, this state-of-the-art feature can keep a truck* stopped when the driver removes their foot from the brake. Brake Hold Mode can be engaged by pressing the brake pedal all the way down. It automatically disengages when the driver accelerates.

*with DT12 Transmission

Lane Keep Assist

Lane Keep Assist reads and tracks lane markers to help drivers keep their trucks centered in their lane.

Lane Departure Protection

This safety feature detects when a truck drifts out of its lane and then actively steers it back on course.

Side Guard Assist

A game changer for safety, Side Guard Assist detects objects on the passenger side of the truck and alerts the operator.

Active Side Guard Assist

This industry leading technology detects and actively prevents the truck from making a right turn into moving cyclists and pedestrians in urban situations.

Durable and Expansive Windshield
  1. FIELD OF VISION - Delivers best-in-class field of vision thanks to a surface area that's 28% larger than our previous product offering, making it one of the largest windshields in its class.
  2. ONE-PIECE DESIGN - One-piece, roped-in design enhances the field of vision with an unobstructed view, while providing easy replacement in case of damage.
  3. SOLAR TINTED GLASS - Standard solar tinted glass reduces heat in the cab, improving operator comfort.
  4. WIDER WIPER ZONE - 24-inch wiper blades that cross over the center of the glass for a 37% improved wiper zone, giving operators greater visibility and a more unobstructed view.
Dual Stage Intelligent LED Headlights
  1. Impact Resistance - High-impact polycarbonate lenses with additional hard coating protection to prevent cracking, scratching or damage to the headlight from rocks or road debris.
  2. Heated Lens - Optional Dual Stage intelligent heat grids to melt away ice and in humid environments, eliminate condensation, in minutes.
  3. Integrated Amber DRL - Integrated amber daytime running lights that double as turn signals, making the truck more visible to oncoming traffic.
  4. Wide Illumination - LED output is designed to fully illuminate the road, including off to the sides of the vehicle, to reduce eye fatigue while letting operators detect objects sooner.



This is how cab life is supposed to feel.

Trim Level

X-Series Base

X-Series Premium

Daycab: door map pocket does not have a fabric insert

Sleeper: door map pocket insert color matches trim color


X-Series Base

X-Series Premium

Not all seat combinations are shown

The 57X Dash

The ergonomic dash with digital interface features an easy-to-read and customizable layout that displays you the data you need at a glance. With integrated steering wheel controls you change vehicle information and entertainment settings without your hands ever leaving the wheel.

Digital Dash

Features up to six customizable gauges that provides important engine information and alerts from Detroit Assurance and Detroit Connect Virtual Technician®.


Leather-wrapped steering wheel offers integrated controls for stereo, Driver Command Center interaction, cruise control and cruise interrupt, as well as a Bluetooth® connection for mobile phones.


Fully adjustable to provide full range of motion for increased operator comfort.


Allows automated manual and automatic transmission shifting and engine braking functions from the column for safer operation.

QuickFit Dash Access

Located on top of the dash near the windshield, the QuickFit Dash Access lets you easily route wires to power dash-mounted devices.


Remote mirror and window control switches are within easy reach, located on the door panels for convenience.


Three extra-large cupholders are within convenient reach of the operator and designed to hold even the largest beverages.



This is how cab life is supposed to feel.

Mid Roof

Stratosphere High Roof
Available in Mid Roof



Eat, work, relax and recharge with our optional Drivers Lounge, which features a two-seat dinette and work table, which folds down into a comfortable sleeping area when it’s time to call it a day.




Large wardrobe, microwave and refrigerator cabinets for excellent storage.


Sleeping Options

Both single bed and dual bunk options are available to meet your needs.



Large 31.5" x 22" sleeper windows available on 60" and 72" sleepers.



Optional Espar and Webasto heaters are available for increased heating in more extreme environments.

HVAC System

Optional idle-free battery operated dual HVAC system provides up to 10 hours of cooling or 34 hours of heating, with upper bunk vent for enhanced climate control.



Standard LED lighting creates a well lit and inviting space with minimal battery draw.



Optional premium and extreme climate insulation for maximum comfort.



Optional factory-installed power inverters and prewire options.



Get the details on the highway truck created to change the way people think about highway trucks.

1. BBC: 128.5"

2. WB: Up to 361"

3. BA: 54.5"

  • 12" daycab and 24" sleeper side extenders with black flexible ends
  • 72" and 60" mid-roof aero roof fairing
  • Daycab aero roof fairing or adjustable aerodynamic deflector
  • Chassis side fairings with black flexible skirts
  • Optimized drive wheel fairings
  • Flow below mold-in color wheel covers

  • Detroit® DD13® 370-525 HP, 1250-1850 lb-ft
  • Detroit® DD15® 425-505 HP, 1550-1850 lb-ft
  • Detroit® DD16® 500-600 HP, 1850-2050 lb-ft


Western Star provides a wide range of new vehicle engines compliant with EPA, CARB emissions, GHG, and OBD requirements.

Please consult your local dealer to ensure the selection of a product that meets your specific needs.

  • Detroit® DT12® On-Highway Series
  • Eaton Fuller Manual 10-speed or 18-speed

  • 7.0MM X 88.0MM X 279.0MM STEEL FRAME (0.28"X3.46"X10.98") 120 KSI
  • 8.0MM X 88.0MM X 281.0MM STEEL FRAME (0.31"X3.46"X11.06") 120 KSI
  • 11.0MM X 85.0MM X 287.0MM STEEL FRAME (0.43X3.35X11.30 INCH) 120 KSI

  • Intuitive and simple to use PTO control system that makes programming easy
  • Optional Factory installed transmission PTO’s available


  • Detroit® 12,000-14,700 lbs
  • Meritor 12,000-13,300 lbs
  • Hendrickson STEERTEK NXT 12,000-13,300 lbs



  • Detroit® single 21,000-23,000 lbs
  • Detroit® tandem 40,000-46,000 lbs
  • Meritor single 21,000-23,000 lbs
  • Meritor tandem 40,000-46,000 lbs
  • Dana tandem 46,000 lbs


  • Taperleaf 12,500-14,600 lbs
  • AirLiner® 12,500-13,300 lbs
  • Hendrickson AIRTEK 12,500-13,300 lbs



  • AirLiner® single 21,000-23,000 lbs
  • AirLiner® tandem 40,000- 46,000 lbs

  • Drum Brakes
  • Air Disc Brakes
  • WABCO® Anti-lock Braking System (ABS) and optional Hill Start Aid and Traction Control


  • Aluminum 25" cylindrical, plain or polished
  • LH/RH  60-150 gallon (227-568 liter)
  • LH and RH split fuel/hydraulic tank options available



  • 13- and 23-gallon (49- and 87-liter)



Access the latest 57X product information, videos and images.

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