Just bought (06) A3 2.0 TDI S Line Quattro with 40k miles and I am looking to service haldex system. Has anyone replaced the haldex filter and oil on their A3 themselves? Is the principle the same as on the 8L S3 quattro? Checked AVS website for prices and a different filter and oil are listed compared to 8L chassis quattros. Are any special tools required? Any help appreciated.