hi, the sound could well be a ball joint / anti roll bar link or another rubber bush perished under there, a common thing to go on VAG's, not an expensive fix and can be done in an hour or 2 depending on what tools and set up you have.
ATF, ask your local main dealer, you may find that they sell the specified type as they wont tell you what type it is, they will just have a part number for it and tell you how many Litres you wil need.
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