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Mercedes M180 Straight Six Gasoline Engine

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Under the hood is the standard-issue Mercedes M180 straight-six gasoline engine. Displacement is 138 cubic inches (2.2 liters), and from the factory it was rated at approximately 82 horsepower. This particular engine was modified with a high-compression head from Expedition Imports, which boosts the output to approximately 96 horsepower. The engine also has a Pertronix ignition and a block heater. Unimogs use a 24-volt electrical system, and this rig has dual batteries to power the electronics.