See also:

Important features in the engine compartment
BMW X5 BMW X5   1. Filler neck for washer fluid for the headlamp and window washer system 2. Starting aid terminal 3. Coolant expansion tank 4. Engine oil filler neck BMW X6 BMW ...

For 520i and 528i: Check oil level
The concept The oil level is monitored electronically during driving and shown on the Control Display. If the oil level reaches the minimum level, a check control message is displayed. Displayi ...

Coolant temperature
Should the coolant, and with it the engine, become too hot, a Check Control message is displayed. Check the coolant level. ...