If I am not mistaken all Sport package calipers are painted with the nissan logo on them. I guess it can oxidize but if it happened quickly and the car is under warranty maybe you can claim it was never sealed properly. Either way if you have metal/steel calipers if you live in a damp climate with a lot of humidity and moisture and or salt in the air from the ocean you will notice an orange grime on the rotors and calipers almost daily. This can not be prevented. I live on the ocean and need to replace rotors yearly because of this issue and the things pitting due to the salt. Good luck moving forward but dont let it stress you out as long as the car stops right.
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