Callipers Red Paint damaged by Brake Oil?

[gtmartini]

Hello,

I own a Boxster S (MY 2000) and last week went for a brake oil change at my local Porsche dealer.

This weekend while cleaning the car I've noticed that two of the brake callipers (one in the rear and the other one in the front) have the red paint damaged, like if something corrosive has had contact with the red paint (the red paint didn't actually get off, but the shinny red colouring gave place to a dull magenta color, starting at the calliper oil hose and descending through the calliper in a irregular liquid-like shape).

I've been today at the dealer, but they say that this corrosive marks were not the result of the oil change and some subsequent brake bleeding that was not propely cleaned, and state that "Our brake oil is not corrosive" and that "we change lots of brake oil and it never happend such a thing". They suggest that this may be the result of some wheel cleaning product used to clean the wheels (:-o).

However, I've only noticed these (very well visible) marks after the oil change, and I find it difficult that they may have scaped my observation if they were result of bad wheel cleaning products over time!

On the other hand, as far as I know, Brake Oil is known to be very corrosive! Does anybody confirm this?

What is your opinion about this situation?

Thanx in advance,

GT