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I use straight 80 gear oil for the box, and LSD 75W80 oil in diff.
Don't know about capacity from empty, but 1 pint(or 500ml) is enough easily for my top ups.
tabetha
T5 box I've ONLY ever used the automatic oil Dex 2 with NO complaints and for the axle SAE Hypoid 90,the rear axle from empty will take around 1 litre!