My Hyundai Santa Fe diesel auto has 62k miles, is 4 years old and hence still has one year warranty. The car has been and still is ideal for my needs and I have no particular wish to change it. However reading your comments on the expense of ageing diesels and, given the warranty situation, the next 12 months might be a good time to swap. Your advice as to the likely expenses to arise and the tactics to be adopted would be appreciated.