I have a slight problem with my US spec '98 A4 2.8 Quatro.
It seems that the oil pools around the oil filler cap and then will
drip down on to both the plastic covers and on to the head and exhaust
I've replaced the oil filler cap once, but not the rubber seal that
fits under it. Is that rubber seal supposed to be sealed down?
The seal is only held on by the tightened filler cap. You can try to
replace it again but it is probably a symptom of a bigger issue. You
might be getting excessive blow-by on the sides of the pistons due to
worn rings and high miles. If this is the case you will have the shoice
of rebuilding the engine or just living with the issue.
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