The Mercedes M139 Is The Most Powerful Production 4-Cylinder, But That Hasn't Made It Universally Popular

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• JalopnikLean L·5h ago

  The Mercedes M139 Is The Most Powerful Production 4-Cylinder, But That Hasn't Made It Universally Popular

  Mercedes-Benz built a four-cylinder engine with more horses than any other, but that didn't shield it from U.S. criticism. They liked it better in Britain.

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