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What is the black gunk?

518 views 4 replies 4 participants last post by  calgordon 
#1 ·
Hi folks
I have removed my instrument cluster to do the speedometer gear replacement and replace the trouble lights, and general clean up and detail. As I peered into the dark abyss I noticed a tarry black sludge around a hose fitting. Anyone know what this is and why it might be there? See pic.
Thanks
Cal
87 560 SL
 

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