Audi are great at taking the p!ss with servicing costs.  Once had my S3 in for a service and they phoned me up and "advised" me of other things that needed doing, coming to a grand total of £2100!!    Once I'd wiped the vomit from my chin, I told them politely to f*ck off.  My favourite was £600 for a new central warning display because one of the lines of LCD was out!!  They also wanted to charge me something in the region of £70 for antifreeze!!  I was like "are you using Grey Goose Vodka??" 
  
Just booked my zed in for a P1 service this morning btw.  £160.  Sold!!  Oh the joys of owning a Datsun!!