POWERED BY PROVEN PERFORMANCE
The Detroit® DD15® Gen 5 is the latest achievement in industry-leading power and productivity from Detroit®. Engineered for greater reliability than ever before, the DD15 Gen 5 has the power and productivity to meet the demands of any application. Versatile enough to be used on construction sites, in quarries or in logging operations, it delivers the proven power that gets payloads moving quickly with longer maintenance intervals than ever before, all while achieving GHG21 compliance.
DETROIT DD15 GEN 5
Just a few of the updates that build on our proven platform include:
- New piston design with increased compression and improved combustion swirl for greater fuel economy
- New ball bearing turbocharger that reduces friction to improve performance and fuel efficiency
- New aftertreatment system that’s smaller and lighter with greater performance
- Improved EGR design and reduced emission system complexity
- Reduced idle RPM
- Increased common parts across models
ENGINES
DETROIT DD15 GEN 5
Backed by years of proven performance, the new Detroit DD15 Gen 5 takes efficiency, reliability and durability to the next level. Perfect for any work site operation or off-road conditions, the DD15 delivers everything you need from an engine, including greater profitability.
HORSEPOWER
400-505HP
TORQUE RANGE
1,550-1,850lb-ft.
DISPLACEMENT
14.8L
DETROIT DD16
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.
HORSEPOWER
500-600HP
TORQUE RANGE
1,850-2,050lb-ft.
DISPLACEMENT
15.6L
CUMMINS X12
At just 2,050 pounds, the X12 is 600 pounds lighter than its predecessor, offering the highest power-to-weight ratio of any heavy-duty engine from 10 liters to 16 liters.
HORSEPOWER
350-500HP
TORQUE RANGE
1,250-1,700 lb-ft.
DISPLACEMENT
11.8L
CUMMINS X15
With power and productivity, the Cummins X15 offers all-around performance with features like superior fuel and lube filter capacity that offer longer service intervals to optimize operational costs.
HORSEPOWER
400-605HP
TORQUE RANGE
1,450-2,050lb-ft.
DISPLACEMENT
14.9L
DETROIT DT12 VOCATIONAL TRANSMISSIONS

VOCATIONAL FEATURES
GEARING
A wider overall ratio for improved startability and low speed maneuverability with a new planetary gear set design for greater input torque and GCW limits with improved durability.
ROCK-FREE MODE
Staying in drive and using the accelerator pedal gives the ability to break free from wheel-stuck situations and related downtime.
OFF-ROAD MODE
Specifically designed to take on off-road driving conditions with optimized shift maps for extreme road conditions.
PAVER MODE
The DT12-V and the DT12-VX enable a constant flow to paving machines by shifting from Neutral to Drive without depressing the brake pedal.
SIDE PTO
The DT12’s side PTO provides dependable performance and, when combined with the rear PTO, offers dual PTO usage that further increases job flexibility and application coverage.
POWER LAUNCH
Automatically increases engine speed up to 1,200 RPM during launch for smooth, powerful takeoffs with heavy loads while protecting the clutch and driveline.
To help you build exactly the truck you need, we offer a full range of both Eaton Fuller and Allison transmissions.
To spec the exact transmission you need, find your nearest Western Star dealer through the link below.
DETROIT DT12-V
AUTOMATED MANUAL
VOCATIONAL TRANSMISSION
TORQUE
up to 2,250lb-ft.
GCW
160,000lbs.
REAR PTO
Yes
FRONT PTO
Yes
DETROIT DT12-VX
AUTOMATED MANUAL
VOCATIONAL TRANSMISSION
TORQUE
up to 2,500lb-ft.
GCW
330,000lbs.*
REAR PTO
Yes
FRONT PTO
Yes
EATON FULLER
MANUAL AND AUTOMATED
MANUAL TRANSMISSIONS
TORQUE
1,650-2,250lb-ft.
GCW
170,000lbs.**
REAR PTO
Yes
FRONT PTO
Yes
ALLISON
AUTOMATIC
TRANSMISSIONS
TORQUE
1,650-1,850lb-ft.
GCW
170,000lbs.**
REAR PTO
Yes
FRONT PTO
Yes
*Application approval required over 160,000 lbs.
**Application approval required over 170,000 lbs