2 liters sounds about right. i bought a gallon of hyd oil and did a total flush. disconnected the return line and attached a clear hose into an old jug. pumped all the old ATF out.....and then added hyd oil to the tank. the drain hose ran clear after only about a quart. kept flushing for good measure. ended up with about a quart left and that's after a complete flush and probably flushing out 1/2 to a quart of new fluid as well.

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5