HI all. Can anyone let me know how regularly and how soon in the cars life this quattro fluid should be changed. I have done 18K already had its first service but have now had a flyer from Audi garage telling me I need it doing. Just spoke to them and they weren't too convincing in telling me its not due a change yet. I remember back to my S3 days and I had it done but if I remember I was quite surprised it was so soon. Many thanks Phil PS Now got an A4 Avant Sline SE. 2.0T FSI Quattro!