19" 5 arm rotor anthracite deterioration
 

Hi all,

I'm new to this forum so really hope someone can help.

I have a 2013 A4 2.0 TFSI Black Edition which I purchased off Audi as a ex demo in excellent condition with 16000miles on the clock about 6 months ago.
I have noticed some difference in the quality/colour of the wheels and it has gone a lot worse quick. Its obviously still under warranty but am pre empting audi to fog me off, do you think I have any grounds to take it back? It's nothing I have done and the two bad wheels are front driver side and rear passenger side which is strange!

Any help on what the cause might be or advice on what I should say to Audi would be very much appreciated.

4 Photos attached which show to normal wheels and two faded, hopefully should be easy to tell the difference.

Kind regards

Phil