At that mileage id be very surprised if the chains were streched. If you mean that the top end is slightly rattly. More like a tappety noise, then the hydraulic cam followers are more than likely the fault- (its hard to say for sure without listening to it) Mine is a little bit tappety, especially from cold. Over time they dont charge up properly and then you get a larger tolerance between the camshaft and the top of the bucket tappet. It wont do any damage but i wanted to get mine changed to get it purring again. Genuine ones from VW are £17 each + VAT!! 12 needed.... You can get a set thoug