Ive had this car 4 years bought it with 6,800 miles on the clock, now has a total of 20,500 on the clock. Serviced every year by VW. But now I have been told the exhaust valves have gone & could cost me £300 +. I've seen on this site some Golfs have had this problem but cant find anything to do with the Polo. I have owned several cars prior to this but this is the newest by far & never had this sort of problem. Is it acceptable for these Valve(s) to go so soon & with so little mileage . Any help/advice would be great.