Hello,
Thanx for your reply.
As far as I can remember, I haven't noticed it before (and I wash my car very frequently, so I wouldn't had missed it)!
And the mechanic at the Porsche dealer also does not seem to remeber the caliper paint being damaged when he performed the oil change...
And yes, it is not hard to believe the caliper paint may be resistant to brake oil, but perhaps only during small amounts of time of contact. I begin to suspect that they may have forgotten to clean propely the oil that spilled over the caliper, and during the 3 days it stayed in contact with the paint (in other words, until I washed the car in the weekend), some corrosion may have developed...
Anyway, the excuse given by the Porsche dealer that brake oil is not corrosive starts to seem each time more supicious...
Regards,
GT