Do it yourself, like Zimmie said jus keep checking the dipstick. Throw in 4 bottles (4L) check the dip stick, if its bearly at the low mark, you probably need atleat 1L. Keep adding about 1/2 L and check until it gets to where it needs to be.
After you do it the first time you will know how much your car takes. probably like 4.5, 5L, 5.5L.
Oh ya almost forgot, once u think u have it at the right level, go start your car for 5-10sec. Go back and check ur oil, it will go down about 1cm, bcus before the oil filter was empty, now its full with oil. so top it up and your ready to go.