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I searched for an ATF fluid for my A6 Tiptronic ZF 5HP19 transmission and almost everyone recommends using the original Esso LT 71141 or dealerâ€™s Pentosin fluid. I could not believe that thousands ZF transmissions used in US vehicles (GM, Chrysler..) are not supported with a domestic ATF. I wrote a letter to at least three known ATF blenders and the most positive answer is from Shell: