Before we get a bit too carried away with what started out as a bit of a joke, the gunk is no more carcinogenic than used oil drained from the engine or black smoke from the exhaust.
You'd have to be taking daily baths in the stuff or eating it, for it to have any effect at all ... and if you ate it, poisoning not cancer would be your main concern.
It's not dangerous on skin contact, so quit beating up on yourselves about it.
I still can't believe my joke about EGR sludge-disposal specialists was taken seriously!
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S80 D5-S manual (facelift) MY04 (avec V70 driver's seat)
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