Range of markings on dipstick:
WARNING: This page is about a different car, the 2006 Audi A8, 2005 Audi A8, and 2004 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
a - Oil must not be added.
b - Oil may be topped off. After topping off, oil may be in range - a -.
c - Oil must be added. After topping off, it is sufficient if oil level is somewhere in range - b - (shaded area).
NOTE:
- Oil level must not exceed mark - a - on oil dipstick.