Cummins’ venerable 5.9-liter diesel engine has undergone many revisions. Here are some highlights of each one. What is a 5.9-liter Cummins diesel engine? Well, for hardcore enthusiasts ...

In fact, fans say these iterations are among the best years for Cummins diesel engines. Naturally, no engine is perfect, and while revered, the 5.9-liter Cummins does have some notable weaknesses ...

The second generation of 5 ... best abilities, modifications focused on creating more horsepower will have no effect on the engine. With the success of the P7100 injection pump in the 5.9L ...

The journey, which started with the first generation 5.9-liter 160 hp turbo diesel ... has what it takes to enter the list of the best Cummins diesel engines to ever make it to a RAM truck.