We’re not going to complain that cost cutting and parts sharing with four-cylinder engines brought about the return of the inline-six. Instead, we’ll bask in the glory of silky-smooth revs and perfectly balanced combustion. In the S-Class, this new 3.0-liter engine makes 408 horsepower and over 368 pound-feet of torque. That’s a significant step up from the already hearty 333 horsepower and 354 pound-feet of torque developed by the current V6. In AMG guise, the engine is expected to make about 430 horsepower.

Look for two turbochargers — one exhaust-powered and one electric — as well as a mild-hybrid 48-volt system. These new engines will kick of an AMG 53 range, presumably replacing the V6 in cars like the Mercedes-AMG C43 and E43. The first model with the M256 will be the all-new CLS-Class. Rumors suggest that the AMG variants of the E-Class coupe and cabriolet will drop the V8 altogether in favor of the inline-six. Don’t worry, the beloved E63 sedan and wagon aren’t going anywhere.

Everything with the 53 moniker will pack the new inline-six, supplementing the 4.0-liter twin-turbo V8 in all the 63 models. Since the U.S.-market S-Class is getting the V6, the new CLS-Class is likely to be the first American model with the new engine.

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