Contact corrosion!

Contact corrosion can occur if non-approved fasteners are used (bolts, nuts, washers etc.).

For this reason the manufacturer installs only fasteners with a special surface coating (Dachromet). These parts can be identified by their greenish color.

Both rubber and plastic parts as well as adhesives are made of materials which are not electrically conductive.

If you are not sure whether used parts can be re-installed, always install new parts.

Please note the following: 

Always use genuine service replacement parts. These have been tested and are compatible with aluminum. 

Accessories must be approved by AUDI AG. 

Damage caused by contact corrosion is not covered by the warranty.