Hi, my 58 plate a3 1.8t is telling me it needs a service in 2 days or 3000 miles. Went to book it in with audi and apparently it will cost Â£309 i was expecting it to be Â£159. How do you tell which service it actually needs, and what does the major give you for double the price? According to the website they change the spark plugs and thats it. I think it has only covered about 10000 miles since the last service which the previous owner had done at about 45000, so surely it only needs an interim service? Do the dealers even know which it's due or do they just quote the most expensive?