Might be useful for people
Haldex coupling – holds 0.42 litres of oil and when changing it you are only draining 0.25 litres and refilling it with 0.25 litres (Part No: G 052 175 A1)
Rear diff – Holds 1.0 litre of oil and when drained is empty and requires 1.0 litre to refill it, handy as thats the size of bottle vw supply the oil in (Part No: G 052 145 A)