Can't find any info about that in B3 haynes manual, and I'm too lazy to open bentley manual. In any case, it's likely that manufacturer haven't set any filter change interval, because the main cause for need to change fuel filter is not time or mileage, but cleanliness of the fuel and usage habits; for example doing some offroading in a quattro might end up sloshing up some dirt that had settled at the bottom of the tank...
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