Is this polo a diesel if so the chances are you are heading for the same problem i have now! Disaster! the bearings may be going in your gearbox these gearboxes are prone to this i am now told! trouble is they are so hard to find second hand and new are well lets just say its cheaper to get a new car! Take it in the garage if it needs a repair to the gearbox get it done itll save you time and money in the long run. I do not know if this could be the same for a petrol gearbox but it is a possiblity Good luck