Hello Miguel,
Perhaps a couple of questions if you don't mind:-
Have you actually been changing the oil yourself or getting oil changes done? If yourself, what brand of 5w30 have you been using?
Are there any signs of blue smoke on acceleration, or evidence of any oiliness at the end of the exhaust?
Has this oil burning suddenly occurred, or just gradually getting worse, and if so, over what period of time/mileage?
Others more experienced than me with this particular engine will possibly discount this, but have you looked at and cleaned, the crankcase breathing system - if it has one- which I would have thought it has.
Once we know a bit more, it might be worth changing the oil using the recommend grade which I would believe to be the 5/30 fully synthetic you are using, but using the Quantum brand which VAG recommend. I would invest a bit more and use their Longlife 3 grade.
If it then still uses oil then I guess you could try a good quality 5w/40 fully synthetic oil and see what happens with that.
Kind regards,
Gareth.