I finally received my brand new Fiat 500 1.2 Sport this afternoon.

However as I drove it home I noticed that the moment I put it in fourth gear it began to whine! Fine in fifth and all the other gears but enough noise that I didn't want to use fourth.

Took it straight back to the garage who agreed and are keeping it for the service department to inspect tomorrow.

Anyone had the same problem or any idea what it might be? Is it serious?!