Two completely refreshed models are major changes found in the 2009 BMW range. BMW's top-end 7 Series sedan receives an extensive re-engineering that includes a regular and extended wheelbase model. A host of advanced safety features such as blind spot alert as well as lane departure warning is available on the 2009 BMW 7 Series. For BMW buyers seeking the Z4 sports car, a redesigned 2009 version of the two-seater receives sharper styling and increased amenities such as a retractable hardtop. While the BMW 3 Series and X5 have long been offered with a diesel engine option in Europe, the auto company has brought the powerplant option to the United States for 2009. BMW's iDrive controller system has received an update that will be rolled out across their model line.