As a result the E38 models can all be easily upgraded with the newer BMW technologies introduced in the 5-series ( E39 ) and X5 ( E53 ) , including BMW 's Bluetooth System , the DVD based Navigation system , as well as BMW 's CD changers that play MP3s
The BMW 7 series upgraded their technologies that were introduced in the 5-series ( E39 ) and X5 ( E53 ) .