This little guy isnt even noted to be changed in the manual service interval! I believe it needs to be changed. I would say near every 50,000km/2 years or sooner if you've store your car for a long period of time.
Grab a oil pan as fuel might spill out.
2005 A4 3.0 Quattro PN#:
OEM - 8E0 201 511 J = $74.90
Before getting started you can pull fuse 28 on the driver side of the dash and start your car. It will either start and die, or just crank. Meaning most fuel has been evacuated. Loosen your gas cap and stick it on your driver seat as a reminder to reinstall it.
Remove the under body panel, a combo of 10mm, 20t, and a pressure pin.