VW claim their gearboxes are 'sealed for life' and NEVER require a fluid change. I take that with a pinch of salt and would get the fluid changed ASAP. All oil breaks down over time, and changing it is a simple job. Just ensure you get the correct grade of oil.

Many gearboxes are now "filled for life". But bear in mind that the "life" of a car in the OEMs eyes is usually about 120k to 150k miles. Also, very few OEMs fill their gearboxes with the very best fully synthetic transmision fluid. It only has to last the duration of their testing, remember!!!

I've just filled my Saabs gearbox with Redline MTL, a popular oil for this box and Scooby boxes. It probably isn't necessary to use something like this in the box of a 1.2 Polo.

Check out the Opie Oils website for the correct grade. I'd suggest changing at 30-50k normally. In your case I'd repeat change after 5k. Change when the box is nice and warm.