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Diesel

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A revised Cummins turbo-diesel six-cylinder engine makes the refreshed 2025 Ram 2500 one of the slickest-driving heavy-duty trucks on the market.
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For 2025, a new 6.7-liter Cummins turbo-diesel six-cylinder makes a little more horsepower than its predecessor in the Ram 2500 and 3500 Heavy Duty trucks.
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For the 2025 model year, Chevy has kept updates to just some new colors and changes in standard equipment across the Silverado 1500 lineup.
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Another major GM recall affecting diesel-equipped pickup trucks and SUVs involves a transmission control valve that may fail.
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Diesel engines don’t have spark plugs; instead, they use the super-heated air created by their high compression ratios to ignite the diesel fuel as it’s injected into the cylinder.
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Die-hard fans may lament the passing of the Hemi V-8, but the 2025 Ram 1500’s new Hurricane twin-turbo straight-six engines make up in power and smoothness what they lack in audible growl.
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Cold weather adversely affects diesel engines more than gas engines, but that’s only partly due to the engine itself.
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Ram will recall more than 600,000 heavy-duty pickup trucks to reprogram their emissions-control systems after it was discovered that the trucks contain software that allowed them to emit more than the acceptable level of nitrogen oxide.
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Chevrolet has given both SUVs a mid-cycle refresh for 2025 to add new tech and help make them feel smaller.
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Chevy has given the Tahoe and Suburban a mild update with some freshened styling, a bump in power for one of the three available engines and a revised interior.