Ever wonder what secrets your BMW has on-board? Here’s an interesting discovery about a secret menu that BMW does not want the regular consumer to see. There are in fact, a number of hidden features that include makes the following possible:

● Change the BMW M5 language to German.

● Find faulty lights using the display test featured on the OBC that activates all the LCDs and LEDs.

● Show the current speed readout in digital format and check the speedometer’s accuracy through the iDrive hidden navigation.

● Check how many liters of fuel are currently in the tank.

Here’s a video of the instrument clock’s hidden menu on-board the BMW E60: