On-highway engines

Maximizing fluid economy in a heavy-duty diesel powertrain begins long before a new truck delivers its first load.

MELBOURNE, AUSTRALIA - Cummins is advancing the conversation around heavy-duty transport performance at TruckShowX, building on the landmark debut of its fully integrated powertrain at the 2025 Brisbane Truck Show to demonstrate how the system delivers real-world results for fleets across Australia.

Engine nostalgia or not, Cummins’ latest X15 diesel is its most reliable heavy-duty engine yet, improving total cost of ownership for fleets and owner-operators.

When shopping for new trucks, experts say fleets and owner-operators should look past the sticker price and focus on the total cost of ownership (TCO).

From tough terrain across the United States for UPS to steep grades in Canada, Cummins’ X15N natural gas engine has spent its first year proving it can handle heavy hauls while delivering near-zero emissions at a lower fuel cost than diesel.

What if the stuff we throw away could keep trucks moving? In this episode of Power Onward, Kim sits down with Dave to talk about renewable natural gas, aka RNG, and how it turns things like landfill trash, cow manure, and food waste into clean, usable fuel.

Fleets that are already using natural gas trucks stand to gain additional value by expanding with Cummins’ portfolio of natural gas engines.

Fleets and owner-operators have long known that extending oil change intervals can lead to significant cost savings and environmental benefits.