After talking to various mechanics each of who had a different opinion I confess that I am unable to understand what is the best oil for my car.
I live in Athens-Greece which means that we rarely have temperatures below 0 and we often have temperatures above 40 (Celcius).
My car is a Seat Altea XL (2010) , Turbo 1.8TSI which I purchased last year. When I took it to SEAT authorized service for the first check , they suggested Castrol Edge 5-30 but in less than 6.000km the car needed an oil refill.
Here you can see the manual page which has plenty of options to select from.
Anyone can explain how to select the most suitable oil?