WARNING: This page is about a different car, the 2012 Audi Q5, 2011 Audi Q5, 2010 Audi Q5, and 2009 Audi Q5. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Coolant Reservoir Marking
Courtesy of AUDI OF AMERICA, LLC
The coolant level must be at that MAX marking when the engine is cold.
Coolant level may be above MAX marking with engine at operating temperature.