So my Haldex has failed, and I have tried a new controller to no joy, it's looking like a new rear diff - Great. Having looked at my service log, I notice that between 2008 - 2011, it had a couple service with XXXXXXX. I know this place well as I spent two years between 2009 - 2011, working up the road and walking past it at lunch, small world. Anyway so at this time it had its 43155 mile service, as which time it should had had its Haldex coupling oil changed, it wasn't as per the service record in the service book, jump forward to present day, and in Feb this year I asked the garage at the top of my road to complete a full service being it's the first one I have given it, at 69513 they didn't recommend that I needed the Haldex oil changing as it hadn't been changed the whole of its life, nor did the dealer who I bought it off who had it serviced (without the haldex being changed) after buying I suspect off XXXXX or the Lady in the log book who lived near by. Am I at fault for not knowing everything there is to know about how the Audi Quattro system works no, am I at fault for not checking the service record yes.....THEREFORE IF YOU ARE BUYING A Quattro car check the service record if it hasn't had the haldex changed when it should had don't buy it or get the dealer to do it and pay for it. Still going to give Audi a stinking email, even thought I suspect it will go no-where. Regards Gutted P.S anyone got a rear Diff for sale.