hi all,got a new 51 reg audi A4 nov 2001 after 6 months old ring audi uk about me servicing vehicle, ans was no you will lose warranty,rung three times over 18months,still the same,phone went round audi like a hot potato.friend of mine at audi dealer said it had to come in within two years for a service,so i gave it a service at one year using gen parts and he reset the service light to long life,oct2003 comes along,time to ring audi uk again and the ans was yes you can service the vehicle without no loss of warranty providing i used gen parts,i got them to fax this in writing and they did! HTH Dave Cogan