In the trunk of my 83 300D, I have all the correct drain plugs in place, but I know the white parts of the INTERNALS of my CD changer, mounted on the ceiling of the back of my trunk get soot into them. Its not really soot partculates, but it is a black discoloring that wipes away.

Ive replaced all the leaky exhaust components, and it still gts in. I think its when at idle, the exhaust can seep through the back of the trunk (there are air outlets and seals that probably arent 100% as well), and it disperses and ends up everywhere. I guess they should have made the outlet just slightly lower, or to stick out a tad bit.

JMH

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)