The Duramax is a family of 6.6-liter diesel V8 engines produced by DMAX, Ltd., a joint venture between General Motors (GM) and Isuzu. The engines are manufactured in Moraine, Ohio, with the Duramax block supplied by Fritz Winter, a German foundry. First installed in 2001 Chevrolet and GMC trucks, Duramax engines are now an option in pickups, vans, and medium-duty trucks. They are known for their durability, power, and efficiency.
Duramax engines offer superior towing capabilities, excellent fuel efficiency, and reduced emissions. Regular maintenance, including oil changes and fuel filter replacement, is essential for maintaining optimal performance. The Duramax has evolved through several generations, with power increasing from 300 hp and 520 lb-ft of torque in 2001 to 470 hp and 975 lb-ft of torque in 2024. As of February 2026, the latest L5P Duramax engine can produce 470 horsepower and 975 lb-ft of torque. A Duramax 6.6L diesel engine long block can cost around $7,655, with prices varying depending on warranty. Used Duramax engines are also available, with prices ranging from approximately $4,300 to $5,750.
