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#1
04-23-2007, 04:59 PM
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Black Oily Substance at Exhaust Joint
Forgive the lack of proper terminology, but...
In the middle of the exhaust pipe, about halfway down the length of the car, there's a joint of some sort. And around that joint there's a black, oily substance which I just recently noticed. I suppose this might be motor oil (turbo seals, valve seals, etc. that need to be replaced), but I have not been able to detect ANY drop in oil level on the dipstick. So....could the black stuff be soot mixed with moisture of some sort?? What are the possibilities? How would a tech be able to figure out what it is? Is there any cause to be concerned? Thanks.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles 06 E320 CDI "Rutherford", Black on Tan, 178k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 75k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
04-23-2007, 06:09 PM
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Probably just soot and condensation. I would not get too concerned about it if car is runnung good.
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#3
04-23-2007, 08:15 PM
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there are many byproducts of combustion, h2o is one of them, I would be more concerned about a possible exhaust leak rather than a bit of black schmegma on he exhaust pipe
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Cheers, Robert
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