BMW says it will offer a four-cylinder engine in its Z4 roadster and 5-Series midsize sedans when they begin arriving on U.S. dealer lots by October, and the company says more nameplates will get the smaller engine with the Munich-based automaker's TwinPower turbo. BMW dropped the engine from its 3- Series line in 1999, when gasoline cost $1.14 a gallon.2012 BMW 6-Series Coupe M-Sport and Z4 2.8i Photo GalleryAston Martin Zagato V12 Photo Gallery2012 Jeep Wrangler PentaStar Photo Gallery2012 Toyota Camry Photo Gallery2012 Porsche 911 Carrera Photo GalleryConcours d'Elegance 2011 Photo Gallery2012 Mercedes-Benz SLK55 AMG Photo Gallery
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