With the age of the car, it could just be part of the evolutionary process , but I agree it sure looks like a valve stem seal. Fastlane lists the inside diameter of both intake and exhaust seals as 10mm. -Reid

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Reid
Past ('59 220Sb, 2-'59 190's, '92 300D 2.5T)
Current
'04 E320 4Matic Wagon
'00 E320 4Matic Wagon