anyone know how much a 20k service is on an sti,have had one quote so far from a local dealer who said £225 +£67 for air con service as well.

 

The 22.5k service should be one of the cheaper ones.

http://www.sidc.co.uk/faq.htm#2.3

Unless anything is replaced it's just an oil change. In which case £225 is well expensive. If you assume £60 for oil and filter at a dealer then it can't be much more than 1.5 hours labour (ie, another £60). Shop around if I were you. Where are you based - people on here will be able to recommend somewhere.

 

Sorry just realised you're probably talking about a new age Impreza. The above info is for a classic.