now in it's fifth generation. In 2003, the popular heavy-duty truck offered the Cummins third generation of engines, the 5.9-liter inline-six-cylinder diesel. Another change was a switch to 24 ...

Overall, both the late second-gen and the third-gen 24-valve Cummins engines are considered to be excellent and reliable pickups. Both generations are easy to modify and produce high torque ...