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Pentosin FFL-3 is the approved Porsche fluid for PDK, but a few years back Fuchs purchased Pentosin. It looks like now Fuchs FFL-3, although it does not carry Porsche approve if the same fluid, which is a bit odd, but ok.
Fuchs FFL-3 is 50% the cost of Pentosin FFL-3, but does not share Porsche Approval, but appear it's the same fluid. Sharing for awarness.