Today's diesel fuel lacks much of the natural lubricity that diesel fuels once offered, taking a potential toll on fuel ...

Diesel engines are tough workhorses, but when they lose power or run rough, quick and accurate diagnostics can save time and money. From clogged filters to limp mode, knowing the basics helps you spot ...

Big rigs and commercial haulers often utilize heavy-duty truck engines to move massive loads across long distances.

As a diesel owner, I know the hectic heartbreak of trying to keep such an unpopular drivetrain up and running in the U.S. Most people think of big semi trucks when they think of diesel, or they think ...

The Cummins 5.9-liter 6BT diesel became a legend in Ram pickups, work equipment, and marine use through durability and ...

Perhaps one of the most overlooked items of diesel truck maintenance involves the various fluids that are the lifeblood of these vehicles. Proper maintenance of oil, coolant, transmission fluid, and ...

Elizabeth Nelson, coolant program manager at Polaris Laboratories, a fluid-analysis company in Indianapolis, Ind., tells a story that would strike fear into the heart of any fleet manager. A class-8 ...

Diesel engines in trucks and some passenger vehicles can derate power and go into limp mode, and this can be caused by a ...