It's not uncommon for the filter cap seal (o-ring) to leak after the module has slackened off and been re-tightened. After more than fifteen years under compression, it's likely the rubber has hardened / flattened. You'll never know unless this is renewed and the orange clip is fitted. Most 1.8T owners went though this years ago, but there's clearly some that have hung on. So, eliminate FFS and go from there.
TC
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