X15 diesels showed quick throttle response and strong acceleration on the TRC's tracks. Engine brakes were impressively strong, even at low rpm's. A parade of X15-powered tractor-trailers led the ...

The Cummins X15 engine delivers heavy-duty performance supported by a sophisticated diagnostic system that logs and communicates issues through fault codes. Accessing and understanding these codes ...

Cummins has been planning to debut a diesel-powered version of the engine in its X15 fuel agnostic platform in early 2026, yet with changes to environmental regulations this year, the company is ...