Alongside partners at Ram Heavy Duty, Cummins unveiled its new 2025 6.7-liter Turbo Diesel Pickup engine system. Cummins and the Stellantis automaker also extended their partnership to supply the Ram brand through 2030, paving the way for continued innovation for a preferred option among hotshot trucking owner-operators.
The new 6.7-liter Turbo Diesel advanced engine system and powertrain will be offered in the recently announced 2025 Ram 2500, 3500 Heavy Duty Pickups and Ram 3500, 4500 and 5500 cab-and-chassis trucks.
“We’ve improved the power, efficiency, serviceability and drivability of our latest 6.7L Turbo Diesel engine, making the 2025 Ram Heavy Duty lineup the most desirable yet,” said Jane Beaman, global on-highway and pickup vice president at Cummins.
The 6.7-liter engine system was designed with reliability and durability in mind, while setting new benchmarks for performance and efficiency. It comes with high-output ratings of 430 hp and 1,075 lb.-ft. torque for pickups, 360 hp and 800 lb.-ft. for cab and chassis. The new diesel is optimized with a brand-new 8-speed transmission, providing the right combinations of power, responsiveness and drivability, the companies said.
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“Whether you are towing heavy loads for work or pulling your weekend camper, Cummins’ 6.7L Turbo Diesel is ready for any project,” said Jennifer Rager, Cummins general manager for pickup business. “Engineers have integrated critical, yet versatile, high-performance engine technologies that customers expect at lower emissions. We’re thrilled to continue our partnership with Ram Brand and introduce the best diesel pickup engine in the industry.”
All 2025 Ram Heavy Duty models powered by Cummins received noticeable gains in acceleration and power, Cummins said, driving home stronger overall truck performance and towing speed and responsiveness — faster 0-60 mph and quarter-mile times, especially when towing heavy loads. Noise, vibration and harshness were also improved using helical valve train synchronizing gears, which enable a quieter ride.
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The engine system includes advanced emissions air handling, introducing a new airflow management design. This accompanies a new high-pressure fuel delivery system that offers top feed dry service injectors and a new fuel pump. Cummins’ newest variable-geometry turbocharger for the new 6.7-liter delivers condition-based power output that is now faster and more efficient, the company said.
Serviceability improvements include software updates that can now be executed from inside the truck for comfort and convenience. The oil filter and dual fuel filter are now positioned to enable serviceability from the top side of the engine, improving maintenance ease.
Significantly improved cold-start management comes with integration of advanced glow plug technology, reducing the wait to start time in the harshest and most extreme weather conditions.
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