The Mitsubishi 4D56 is a long-running, robust 2.5-liter, inline-four diesel engine widely known for its exceptional durability and reliability in commercial and off-road vehicles. First introduced in the late 1980s, it has been used in various Mitsubishi models, including the Pajero, L200/Triton, and Delica, as well as licensed for use by other manufacturers like Hyundai.
