When you look under the hood of many Japanese excavators — and quite a few Korean and European machines — there’s a good chance you’ll find a Mitsubishi engine quietly doing its job. Mitsubishi’s industrial diesel range has earned a reputation for reliability, simplicity, torque-rich performance, and long service life. Whether you’re running a 1.5-ton mini excavator or a 20-ton earth-mover, Mitsubishi has produced an engine for that class. This extended guide dives into the f