Just 4 days and less than 50 miles after my Ł500 service in G******d Audi , Surrey - where they noted that the rear left shock absorber was leaking "slightly". I now see large stains like spilled fresh light oil on the drive way. Queestion is whether I need to get this done in an Audi centre or is there somewhere that wont charge me the earth - and how much should I expect to pay. Do I need to repalce both back ones or just teh leaking one. (I guess I shouldnt drive on it like this for too long ) Similarly are there places I should avoid?