Recent spy footage of several prototype GM HD trucks undergoing testing in Colorado has reignited speculation about the long-rumored 8.3L Duramax diesel engine, nicknamed “MegaMax.” The video was ...

General Motors' LBZ Duramax Engine is one of the most reliable engines ever built. Over the years, the LBZ and other Duramax engines have carved out a reputation for durability, reliability, and long ...