Cummins announced it will launch the next engine in its fuel-agnostic series, designed to help customers transition simply to alternative and low-carbon fuels.
The X10 engine, to be launched in North America in 2026, is positioned to replace both the L9 and the X12 for medium- and heavy-duty applications across a 320- to 450-horsepower range.
“The new X10 has been designed drawing on our decades of experience as a leader in the medium- and heavy-duty space,” said José Samperio, Cummins’ North America executive director of on-highway.
He said the new X10 diesel will emit 75 percent less NOx emissions than required by the EPA’s 2027 regulation. Customers can opt to use bio or renewable diesel to further reduce emissions.
While the diesel version will be first available, other versions for gaseous fuels will be introduced later. The fuel-agnostic engines are the same below the gasket, but above the gasket there will be different components depending on the type of fuel used.
“We are committed to advancing diesel technology while our markets and our customers need it to run their businesses,” Samperio said. “We have applied those learnings to ensure the product will perform for our customers and the important jobs they need to do every time.”
The X10 offers low weight and a compact installation for vehicles across the 26- to 44-ton GVW range focused on maximizing payload, as well as low-cab trucks for urban operations. The X10 design incorporates a similar fuel-agnostic capability to that of the X15, with the potential to offer hydrogen and biogas versions.
Though the engine will first be available in Europe and North America, it will be introduced in other regions over time. The X10 slots into Cummins' product portfolio complemented by the B6.7 and X15 and will serve vocational, transit, pickup and delivery, and regional haul customers. It will also eventually be available for off-road applications.
Cummins says a further benefit of the X10 engine is a modular architecture for global applications, in terms of adapting to vehicle configurations, varying emission regulations and customer preferences. The engine can be paired with a variety of transmissions depending on the application including the Eaton Cummins Endurant.
The X10 is equipped with Acumen, which provides digital connectivity and direct, immediate access to a range of applications and capabilities. These include over-the-air calibration, predictive service recommendation and additional features that help fleets keep their trucks and equipment moving.
Cummins almost exactly one year ago to date said its fuel-agnostic carbon-cutting powertrains were meant to be a bridge to its zero-emission, all-electric and fuel cell offerings, which the company acknowledges may not be an ideal fit currently for all fleets given higher upfront costs, range issues and fuel infrastructure challenges.
These new fuel-agnostic engine platforms feature a series of engine versions that are derived from a common base engine, which means they have some parts commonality. Below the head gasket of each engine will largely have similar components and above the head gasket will have different components for different fuel types. Each engine version will operate using a different, single fuel.
Cummins is offering a full portfolio of products in 2026 to cover the medium-duty and heavy-duty customer needs, including the new 15-liter natural gas engine, the X15N. Additionally, the B6.7 will be offered in diesel, natural gas, gasoline and propane.