When shopping for a car, our mind often goes to horsepower. But in the world of semi trucks, balance and torque are the most important things. And that's where the inline-6 engine shines. Unlike a V8, ...

The mighty inline-6 (also known as a straight-six or I6) was once a common sight, powering any number of models from around the world. In the last few decades, however, the V6 has more or less ...