The 6.7L Cummins Turbodiesel has been the backbone of Ram heavy-duty trucks for well over a decade. As competition between diesel manufacturers intensified, Cummins introduced a steady stream of upgrades—boosting power, refining emissions systems, and strengthening internal components to handle ever-increasing torque.
Below is the complete model-year breakdown from 2009 through 2025, including horsepower, torque, emissions changes, and major mechanical upgrades.
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Cold weather affects diesel engines more severely than gasoline engines, and not just because of the engines themselves. By design, diesels require high compression, strong battery output, and precise fuel behavior to start reliably — all factors that become more challenging as temperatures drop.
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The EPA has officially eased several DEF-related requirements for U.S. diesel vehicles and equipment — and for diesel operators across the country, this is a long-awaited change. The update not only removes some of the most disruptive rules ever applied to diesel engines, but it also signals that federal regulators may be shifting toward more practical, diesel-friendly policies moving forward.
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