17/07/2008 06:30. Just as we suspected, BMW has started extreme durability testing in the southwestern part of the United States, taking advantage of the hot temperatures, miles of desert roadways and mountains with steep grades. One of the first to arrive is this twin-turbo V8-powered BMW X5.

Sharing the 407-horsepower X5 will officially be introduced later this year on the auto show circuit. The turbo V8 model will adopt the same ‘xDrive50i’ badge as its... // LeftLane News