Recognizing the need for greener alternatives even at the luxury sedan level, BMW fits the 7-series with its twin-turbocharged 3-liter inline six-cylinder engine, similar to the engine used in the 135i, 335i, and 535i.
January 12, 2010 7:58 PM PST
Photo by: Sarah Tew/CNET
| Caption by: Wayne Cunningham
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