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: Widely regarded as the best Duramax model because it was the last version produced before major emissions systems (like DEF) were added. It is paired with the highly robust six-speed Allison 1000 transmission.
Based on industry data and long-term owner reviews, these models are the top recommendations for used buyers in 2026: best used diesel truck to buy
: Famous for "running forever," often exceeding 400,000 miles. It is prized for its cast-iron block and low-stress engine design, making it nearly unkillable. : Widely regarded as the best Duramax model