Mercedes-AMG recently unveiled the all-new M139 2.0-liter turbocharged engine. It’s a complete redesign of the previous-gen M133 four-cylinder motor in the outgoing Mercedes-AMG A45, CLA45, and GLA45. And, with up to 415 horsepower and 369 pound-feet of torque available, the M139 earns the title of the most powerful four-cylinder engine in the world.
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https://www.slashgear.com/how-mercedes-amg-made-the-most-powerful-turbo-four-cylinder-engine-in-the-world-08583089/
