I removed the pan, you get about 1 to 2 litres, replace this with the same amount as you get out, also clean the filter while the pan is off, mine was filthy. Then take the line off the cooler thats coming from the box, start the car and pump out and measure 1 litre of oil, turn the car off, then replace it, keep repeating this until the oil looks clean.
Took about 8 litres for the oil to become clean.
From what i understand they hold around 12 litres all up.