Vehicles with low-maintenance battery
WARNING: This page is about a different car, the 2013 BMW X5 M, 2012 BMW X5 M, 2011 BMW X5 M, and 2010 BMW X5 M. However, it is still accessible from the selected car via links, so may be relevant.
Check acid level, top up with distilled water if necessary
If level drops below Max. marking, top up distilled water to Max. marking.