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2003 C4S light yellow sludge or gunk around the oil filler tube

Engine

Vehicle Information: Year: 2003; Body Type: Coupe; Total Mileage: 1400;

I am new to Porsche and my 2003 C4S (approximately 1400 miles). I checked my oil level with the gauge today and it was down slightly. When I went to add oil and lifted off the filler cap, there was a light yellow sludge or gunk around the filler tube. This sludge was not dirty, but I have never seen anything like this with other cars I have owned. I wiped this off as best as I could and added about .25 liters of oil. What is this sludge? Is this something I should bring to the attention of my dealer? Thank you for considering my question.

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