I owned 4 Audi's with DSG since 2010. 3 of them were with ~90k when I purchased them. All 3 came with full service history done only by Audi dealership. I changed the DSG oil right after I bought them. On all 3 DSG oil was never changed. I doubt they ever change it unless you specifically ask for it. Just my experience... Same with the haldex and bevel box.

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