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yellow residue oil fill cap

Engine

Model: 996, Year:2003, Mileage:48000, Type of use:Street use only
I jsut went to add some oil and found a gel like yellow residue in the oil fill tube and cap. It has a strange oder to it. The coolant level is slightly below the MIN line but the color appears ok. The oil dipstick showed a slightly low oil level but no discolored or foul smelling oil. The car has been running ok and I do not do short trips. Any idea what the residue is and should I be concerned?

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