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oilly material on rear engine lid near motor for spoiler

Engine

Model: C2S, Year:2005, Mileage:17900, Type of use:Both Street & Track
There is a fine irregularly shaped coating of a black oil like substance on the inside of my rear deck in the area of the fan for the spoiler. I cannot detect any similar substance on my engine and there is no oil consumption. What is the cause?

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