Wow, sounds like you are golden then! I had mayo under the oil cap, but when I replaced the CCV I found many of the vacuum lines were full of mayo too. The vacuum distributor on top of the intake manifold was almost completely clogged. That was the year I bought the car, at about 13 years/95k miles.

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2003 3.0 5MT Topasblau
Purchased in 2016 and sold in 2024
2012 35d Platingrau