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Post moved to the main MKIII section.
I assume we're talking about a turbo model (or one of the very few N/A's which had the added LSD option)... The aforementioned additive is a LSD friction modifier. Ask for it at your GOOD, local parts store or order it online. only add enough so that the noise stops. Too much may cause the LSD to slip too often and cause premature wear of the clutch packs.
If you've got an N/A make sure it's got the LSD option... if not you've got bigger problems and an additive isn't going to fix it.
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