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Yellow foam looking stuff in the top of the oil filler tube

Engine

Vehicle Information: Model: 911 Carrera; Year: 1984; Body Type: Coupe; Engine (type, size, modifications): 3.2L; Total Mileage: 86479;

Recently after driving (twice hitting the rev limiter--not intended) and once again today, I've noticed a yellow foam looking like stuff on the oil filler/dip stick tube. Not a ring, just spots on the oil filler tube. The stuff is oil or feels like oil). Car doesn't burn any oil and sits at 2.0 bar at idle after warmed up. There is no foaming on the oil dipstick when I check oil level. The car runs fine, but I don't remember seeing this before.Mike

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