I had my Cupra looked for the squeaking
problem and i am gonna pick it up tomorrow.They told me on the phone that everything was ok and it was the turbo that squeaked
I said that the turbo whistle was a different sound,which was happening at higher revs and asked if the supercharger was working ok.The guy said''Yeah,the charger is squeaking,it's ok!''
Sometimes there is also a rattling sound when accelerating hard and they said they needed open roads to test it,so if it gets worse they could look into it! When i pick the car tomorrow i am gonna lay on them!