I may be my neck out here but, the original oil filters for the WR engined quattro are Mahle filters the correct filters are OC47 in black and the smaller OC78 in silver, the original filters supplied by Audi came in black and silver with the wording of "Audi Turbo" on the black filter and both the black and silver filter had the Mahle logo on them, at my local motor factors they cost about £12-15 for both, remember clean oil is the life blood of your engine.
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