It is kinda reddish blackish I guess. I brought the car back from the dealer. He says he still can not find anything. This time I dabbed the oil slick on a tissue and took it with me. He agreed it was oil but did not know where it was coming from. His suggestion is if it happens again [will be the 4th time] then to bring it back right away. He will take the plate down and look inside. This time they looked on the outside and just put the fingers on the side and there was no oil!!!
2012 528Xi Black Sapphire Metallic, All Add Ons Except M Sport.
2011 X3 Titanium Silver