So I'm coming up to one year of ownership and I'm being offered an extension to the warranty on my 2013 A6 BiTdi. I've had no sign of any problems and I've added about 8K miles (now nearly 40K), will probably do the same next year so I'm wondering if it's really worth shelling out 400 quid to extend it for another year. I'd have thought that if something was going to go wrong it would have done it by now or it's going to happen when it's a fair bit older. Any thoughts?