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Cummins X15 Diesel Engines For Sale
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Cummins X15 Diesel Engines For Sale

Power
400–605 HP

Torque
1,450–2,050 LB-FT

Shop the Cummins X15 engine for sale at HD Engines. The Cummins X15 was introduced in 2017 as the replacement for the ISX15, a 15-liter inline six-cylinder diesel developed for higher power, improved efficiency, and stricter emissions. Since its release, the X15 has become one of the most popular heavy-duty engines on North American highways, known for strong performance and long-term durability. Every X15 we stock is run-tested and listed with its year, horsepower, CPL, and emissions rating so you can match the right engine to your truck.

Specs Displacement: The X15 is built on a proven 15-liter platform designed for heavy-duty commercial use.

Power Range: The engine is available in multiple configurations, from 400 horsepower up to 605 horsepower, depending on application and calibration. Cummins splits the X15 into the Efficiency Series for line-haul and the Performance Series for heavy work.

Torque: The X15 delivers high torque, from 1,450 lb-ft up to 2,050 lb-ft, to support demanding hauling conditions.

Fuel Efficiency: The X15 achieves strong fuel efficiency through variable geometry turbocharging, high-pressure fuel injection, and optimized combustion design.

Emissions Compliance: The X15 meets several emissions standards, including EPA 2017, EPA 2021, and Euro VI. We list the emissions rating on every engine so you can match your truck correctly.

Along with these specifications, the X15 features advanced electronic controls with the CM2350 and CM2450 modules, integrated powertrain compatibility, and improved aftertreatment systems that contribute to consistent performance and overall reliability.

Why Buy a Cummins X15 From HD Engines?

Fleets and owner-operators choose the X15 for its strong pulling power, excellent fuel economy, and the wide Cummins parts network. At HD Engines, every X15 is run-tested and inspected before it ships, and listed with its serial number, CPL, horsepower, and emissions rating. Our team matches each engine to your truck by CPL or VIN, and with nationwide freight, buying an X15 is straightforward and low-risk.

Buying a run-tested X15 also costs far less than a new engine through a dealer, and you get a documented engine with a known history instead of a gamble. That combination of value and proven Cummins reliability is why fleets keep coming back to HD Engines for their 15-liter replacements.

Cummins X15 Engines We Carry:

Our inventory includes run-tested X15 engines rated from 400 to 450 HP, in EPA17 and EPA21 configurations with CM2350 and CM2450 controls, including Efficiency Series units. Pricing generally ranges from about $18,000 to $21,000 depending on year, horsepower, and emissions. Contact us today and we will match your X15 by CPL or serial number. Call (786) 377-5210 or email info@hdengines.com.

Overall, the Cummins X15 has a strong reputation for power, efficiency, and durability, making it one of the most trusted heavy-duty diesel engines for long-haul and vocational trucking.

Frequently Asked Questions

How much horsepower does a Cummins X15 have?

The Cummins X15 produces 400 to 605 horsepower and up to 2,050 lb-ft of torque, depending on the rating and series. HD Engines stocks X15 engines rated from 400 to 450 HP, including Efficiency Series units for line-haul use.

What is the difference between the Cummins X15 and ISX15?

The X15 is the newer version of the ISX15, introduced in 2017 with updated electronics and better fuel economy. Both share the same 15-liter platform. If you need the earlier engine, see our Cummins ISX15 collection.

What is the difference between the X15 Efficiency and Performance Series?

The X15 Efficiency Series is tuned for line-haul fuel economy, with ratings around 400 to 500 HP, while the Performance Series is built for heavy-haul work with ratings up to 605 HP. The choice depends on your loads and routes.

What emissions ratings does the Cummins X15 come in?

HD Engines stocks X15 engines in EPA17 and EPA21 configurations, with CM2350 and CM2450 controls. We list the emissions rating on every engine so you can match your truck's registration correctly.

Is the Cummins X15 a reliable engine?

Yes. The X15 is built on the proven ISX15 platform and is known for strong durability, often running past a million miles with proper maintenance. Regular oil changes, clean fuel, and quality DEF are the biggest factors in long service life.

Do you ship Cummins X15 engines nationwide?

Yes. HD Engines ships run-tested Cummins X15 engines across all 50 states with freight service. Contact us with your CPL or serial number for a shipping quote to your location.

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