General Motors has been using Duramax diesel engines in certain workhorse models for nearly a quarter century. The 6.6-liter V8 version which powers Chevy Silverado 2500/3500HD and GMC Sierra Heavy ...
High mileage on a 6.6 Duramax is less about a single scary number on the odometer and more about how that number lines up with the engine’s design, maintenance history, and known weak spots. The same ...