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That is a coolant hose. The crap on it and the 4-6 chain area/oil pump looks to be oil/dirt. It could be from bad spark plug o-rings or the AOS going bad blowing oil out the vent on top of head 4-6 under the A/C compressor.
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Rick
99 996C4
06 525XI
87 944S - Sold
77 924 - Sold
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