Exhaust Discharge..

I started my 300SDL up today, dead cold. I was idling it for a while then revved it good a few times to "clear its throat".. got out of the car, looked beind and there is a spray of oil-coated chunks of carbon say 10" long by 5" wide, thats the best way I can describe it. I noticed it once before, didn't think much of it.

I saw this once on a 420SEL that had a totally screwed engine, you would revv it and black raw oil would come out of the tailpipe.

I dont use much oil, maybe 1/qt every 3k miles.. what is this?

If it means anything, I just replaced the center muffler about 1000 miles ago, not sure if it did it before then.