Straight-six engines are a BMW hallmark, but their rivals in Stuttgart could be preparing to adopt the acclaimed engine configuration.

Straight-six engines are a BMW hallmark, but their rivals in Stuttgart could be preparing to adopt the acclaimed engine configuration.

Citing a "friendly Mercedes engineer," CAR is reporting the company has approved a new engine family that will be launched in 2015. Details are limited, but the source said there will be a variety of new four-cylinders, inline-sixes (available in both single and twin-turbo guise) and downsized V8s displacing 4.0-liters.

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Mercedes approves new straight-six engine family - report