VR's hold 12 Litres so im guessing a VS should be similar. EDIT: just looked it up and it is 12 Litres
V6 engine cooling system holds 12 litres, 6 litres of water, 6 litres of coolant concentrate, not the premixed crap. 'Cooling system' means the whole thing, radiator, block, hoses, reserve tank and heater core inside the car. Even when draining and flushing the block, you can't get the whole lot out, as 3 litres sits above the heads, so you need to take that into consideration when changing the coolant over. You can however flush out those 3 litres so that they are replaced with clean water by removing the thermostat and flushing from the top of the block.