Why is my 2.0 TFSI leaking? (Question of the week 4)

Why is my 2.0 TFSI leaking? (Question of the week 4)
Question of the week
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This is the fourth episode of our new question of the week series! Over the weeks we will be looking at a mixture of technical and basic problems/resolutions for your Audi/Seat/Skoda/VW issues.