So I just picked up this 2011 5.0 2 weeks ago and I have been wondering why my rims have this black shit on them. The guys at the dealership said it came to them that way and I washed the car obviously but it looks to me as if somebody tried their own little design or somehow it got dirty and sat for awhile and stuck on there. Anybody have any idea what the deal is?? The pictures aren't the greatest but the middle one shows the black shit the best, the first one was to show that even my brembo calipers are kinda stained and dirty looking. Maybe I should just complete it and black them out fully lol