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 ...

A perennial competitor to Ford's Power Stroke V8 and Ram's Cummins turbo diesel inline six-cylinder engines, the 6.6-liter Duramax is one of the most popular diesel powertrains for heavy-duty trucks, ...