Hi going to look at A4 1.8T with 75k full audi service history but the cambelt tensioner has recently gone and the owners had the engine repaired by an independent at cost of £1600. This concerns me as I wonder why it's gone ie, has it been thrashed??? But i suppose they can just go before the recommended 80 k change? Anything in particular i need to check on this car? a buyers guide would be a great help if there is one. Also it's up for £3900, is this a fair price for the mileage at 75K on a 1996 'N', obviously alot will depend on the condition. etc. Any advice or opinions greatly appreciated.