Page J2-8 of the S5 FSM shows the procedure. I didnt know about the GL4 vs GL5 info that RETed shared so that's helpful.
The key I have found is that you need to remove both plugs on the side of the tranny (labeled C & D in the FSM). You pump fluid into the top hole (C) until fluid comes out the lower hole (D). If you leave D in and fill to the bottom of C, gear oil will slosh out of the vent onto the exhaust. Burnt gear oil doesn't smell like bacon!
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90 S5 Vert. JDM Tii with BNR Stage1 turbo. Pineapple Racing street port. Bonez cat-forward. Corksport cat-back with Vibrant UltraQuiet resonator. RTek 2 wZeitronix w/b. HKS EBC. Vis CF Tii hood. 3000GT wing. Ground Control coilover kit with KYB AGX shocks. Red and Black leather RX8 seats. Corksport Odura lip & bumper caps, OEM Tii skirts
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