dude, look to your left and you will see a key marked "Caps Lock"
Anywhoo, with only 2 litres of oil left, I would say you have a fairly knackered engine. Unfortunately this is common with a turbo charged car that hasn't been cherished it's entire life. Try a compression test, and then do it again with about 10-15ml of oil in each cylinder. If it gets better the second time it is your piston rings, if it doesn't it is probably a dropped valve. Either way, it will make you a sad panda.
The oil resivior on the drivers side of the cargo area is the ATESSA resivior. It feeds oil to the ATESSA pump located just above the rear diff. Treat it just like an auto trans fill point (same fluid even) and it will be fine. Whatever you do, DO NOT let it run dry. That will make you a suicidal panda.
Any other questions, try using the search function at the bottom of the page before you post it - chances are its been asked and answered before.
Oh, and welcome!