The BMW X5 is a luxury crossover SUV introduced in 1999 as the first generation E53. It was BMW's first SUV (Sport Utility Vehicle) also known as "Four-by-Four" (4x4) in the UK. It features all-wheel drive which is branded as the "X" drive system and is available with either manual or automatic transmission. The second generation X5, known as the E70, was launched in 2006, with the first M version announced in 2009. BMW describes the X5 as a Sport Activity Vehicle (SAV) rather than an SUV, to emphasize its on-road ability despite its size. Like the Lexus RX 300 and Mercedes M-Class, the X5 heralded the shift from truck-based body-on-frame SUVs to sedan-based crossovers that would come to fruition in the late 2000s. Until 2009, all X5s were manufactured in Greer, South Carolina at the Spartanburg BMW plant. Since July 2009, they are also assembled in Kaliningrad, Russia by Avtotor. In 2003, BMW launched the smaller X3, which uses the "X" prefix for the 4 wheel drive system or BMW "X" drive system and the BMW SAVs which were derivatives of the BMW number-series models.