The Chevrolet Silverado HD — and its corporate twin in the GMC Sierra HD — can be had with either a standard 6.6-liter gasoline V8, or the optional 6.6-liter Duramax turbo-diesel. Opting for the TD ...
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 ...