Which Engine Is Better: DD13 or DD15?

When choosing between Detroit Diesel’s DD13 and DD15, truck buyers often face a dilemma: opt for the lighter, more agile engine or select the one with raw power and torque? In this guide, we break down the differences and help you find the best fit for your business. *(Bonus: we’ll even show you where to shop smart!)*

Quick Comparison

Feature	DD13	DD15
Displacement	12.8L	14.8L
Horsepower Range	370–525 hp	400–505 hp
Torque	Up to 1,850 lb-ft	Up to 1,850 lb-ft
Ideal For	Regional & short-haul	Long-haul & heavy-duty
Fuel Efficiency	Better for city driving	Better for highway MPG

Why Choose the DD13?

The Detroit DD13 is known for being lightweight and nimble. It’s perfect for:

• Short-haul and regional applications
• Urban driving with frequent stops
• Fleets that want to maximize payload capacity

Shop DD13 Trucks & Parts

Why Choose the DD15?

With higher displacement and torque, the Detroit DD15 is built for endurance and heavy-duty work:

• Cross-country long hauls
• Heavy freight and mountain routes
• Longer service intervals

Explore DD15 Trucks & Equipment

Fuel Economy & Cost Efficiency

DD13 offers better MPG in city routes. DD15 delivers superior fuel economy on highways, especially under full load.

Looking to upgrade your truck’s tires for better performance and fuel savings?

Shop Quality Truck Tires

Which Engine Is Right for You?

Choose DD13 if:

• You haul regionally
• You prioritize lower engine weight
• You want lower upfront costs

Choose DD15 if:

• You drive long distances
• You need high torque and hill power
• You prefer longer service intervals

Final Thoughts

Both engines are reliable Detroit Diesel solutions — your decision depends on how and where you drive. Still unsure? Contact our team or browse inventory to find your ideal match!

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