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 ...
GM Authority has learned that GM intends to buy back certain Chevy Silverado HD and GMC Sierra HD units back from customers due to apparent quality issues with the 6.6L L5P V8 Duramax turbo-diesel ...
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