OK, slow down...If you didn't have the issue before, I have a feeling what you are seeing is the oil that was dumping out of the gasket coated the exterior of your exhaust. Tough to diagnose over the internet, but I would suggest you look at my theory before anything else. The gasket and interior of your exhaust in no way are related. Now, if you ran the motor without oil because of the leak, that is a whole different situation.

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Dave S.
Northeast
2003 4.6is
2005 E53 4.4
2003 E39 Msport(a REAL ONE!)
1959 Fiat 600