clever piece of kit, i suppose the only way to know you got all the oil is that the zed holds about 5 litres of oil, so when you have about 5 litres you're about there.
i like the fact it goes into a sealed container, saves the risk of secondary spilling etc.
(as for the link if you edit your post; highlight the link and then click on the youtube button above; just under the title box it will link it properly)