Latest and greatest engine tech from Cummins

Whether its diesel or natural gas, the next engine in the X Series by North American engine giant Cummins will take the fuel its served and convert it into power

Engine manufacturer Cummins Inc. has announced it will launch the next engine in its fuel-agnostic series, the X10, in North America in 2026.

Cummins says this engine, named as part of the X engine family, is uniquely positioned to replace both the L9 and the X12 with the versatility to serve both medium and heavy-duty applications.

It will be compliant with U.S. EPA’s 2027 regulations a full year early.

The diesel version will be first available, with other versions for gaseous fuels introduced later.

This 10-litre displacement product slots into Cummins’ product portfolio complemented by the B6.7 and X15 and will serve vocational, transit, pickup and delivery and regional haul customers. 

José Samperio, executive director – North America On-Highway at Cummins Inc. says the new engine will keep the diesel transport industry running.

“We are committed to advancing diesel technology while our markets and our customers need it to run their businesses.

“The new X10 has been designed drawing on our decades of experience as a leader in the medium and heavy-duty space.

“We have applied those learnings to ensure the product will perform for our customers and the important jobs they need to do every time,” Samperio says. 

Cummins says the X10 is extremely versatile and will play an important role serving customer needs.

The company is also adamant diesel will remain a critical technology for the commercial vehicle market for years to come, and says it will continue to support it.

Though the engine will first be available in Europe and North America, Cummins says it will be introduced in other regions over time and will be made for off-highway markets as well.  


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The new X10 diesel will emit 75 percent less NOx emissions than required at launch in 2026.

It will be compliant to the U.S. EPA’s 2027 regulations while providing a step change in fuel economy improvement.

The X10 architecture uses a belt-driven, high output 48-volt alternator and aftertreatment heater solution optimized for increasingly stringent emission standards, and will be scalable to other advanced combustion technologies.

For further reductions in carbon emissions, customers may choose to use B20 or renewable diesel.  

The engine can be paired with a variety of transmissions depending on the application including the Eaton Cummins Endurant to enable additional drivability benefits and efficiency gains.

Cummins says the X10 aims to be exceptionally efficient from idle to full power, which is critical for transient applications. Its extended maintenance intervals can help reduce visits to the shop.

The engine is equipped with Acumen®, which provides digital connectivity and direct, immediate access to a range of applications and capabilities.

Cummins says these capabilities provide value throughout the lifecycle of the engine and include over-the-air calibration, predictive service recommendations and additional features that help fleets keep their trucks and equipment on the road. 

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