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Mercedes-Benz inline-six engine is finally coming back to America in the CLS

We're in line with that.

2019 Mercedes-Benz CLS
2019 Mercedes-Benz CLS / Image Credit: CarPix
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Update: A Mercedes-Benz representative confirmed to Autoblog that the M256 engine would appear in the US before the end of 2018, but couldn't confirm or deny which vehicle it'd appear in. Based on this and other information we have, we're confident the engine will appear in the CLS, as Car and Driver surmised.

Engines take a long time to develop. We first heard about the M256 engine last fall, and at that point it wasn't entirely clear if the technologically advanced engine with a classic, balanced cylinder layout would make it to the States. We knew it'd make its world debut in the 2018 S-Class, but that we wouldn't get that specific variant — at least, not at first. So how does America get this engine?

In the upcoming 2019 CLS450, it turns out. Mercedes-Benz confirmed to Car and Driver that it'd be coming to the U.S., which means the CLS450 shouldn't just be smooth, it should be fairly sprightly. The M256 makes a healthy 367 horsepower and 369 lb-ft of torque, plenty for it to move swiftly enough in any situation. There's also likely to be a higher-zoot CLS53, since we know Mercedes will make a whole range of mid-grade AMG cars with this engine, but we don't know the specs on that engine quite yet.

We're expecting to see the new CLS at the L.A. Auto Show next month, so we'll have more details then. Until then, enjoy these mostly-uncovered spy shots of the production CLS ahead of its debut.

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