Hi Bill, Lots of info on threads about what to look for. Mk 6 post 2011 had a revised tensioner (third revision) so should be OK. Not a mileage thing, can happen at almost any mileage/age. Quite a lot of engines replaced under warranty and low mileage. Audi had similar problems. The timing chain is also a bit suspect and can stretch (but not as bad a problem as the 1.4 TSI engines). I believe VW techs have a bit of kit that can check for stretch? So any 2009 - 2011 you really need to have had the tensioner replaced or knock the price down to get it done. Just the tensioner will set you back about 5 hours labour. If getting the tensioner changed also price in a new water pump as they have a habit of leaking when messed with. If buying from a dealer get it done by them as a part of the sale. VW have also brought out a kit that replaces tensioner, chain, chain guides and sprockets - the chain is more robust and a different size hence the replacement sprockets. Don't buy a Mk 6 GTI car that has been chipped. If possible get one that has full VW service history. If VW serviced there will be a record of all the work done on the car and any VW dealer can look it up for you. A few early MK 6 2009/10 also had intake manifold problems with the flaps that alter the air flow when the turbo cuts in failing and that requires a new manifold. About 2 hours labour. A revised design was introduced but not sure when. Check the alloys carefully if you have diamond cut ones as a refurb is about £100 per wheel. Having said all the above, I have a 2010 GTI on 70k and not had any of the problems above and still enjoying the car. Good hunting.