Two links you might want to check out. Neither relates directly to the 2.8 V6 in the Audi, but they are for a 2.8 V6 fitted in a Passat, so in theory, should be the same or very similar (but then we know that VAG never keep anything the same!). If nothing else, they will give you an idea of what you're looking for.
This first one is a diagnostic procedure for determining if you have a leak, and requires a pressure gauge and VCDS:
https://web.archive.org/web/20120412...leakhowto.html
The second one is a YouTube video showing replacement of the entire breather system:
https://www.youtube.com/watch?v=4_BVzgOb2rk
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2001 A8 D2 FL 3.7 Q - LPG Conversion, Engine: AKC, Gearbox:FBB, Colour:LY5X Aqua Blue pearl effect, Interior:WJ light beige/dark beige valcona leather with burr walnut inserts
My DIY jobs -
Replaced alarm horn,
Replaced Coolant Temp sensor,
Updated RNS-D firmware,
Installed Reversing Camera and Digital TV,
Dashcam Installation,
Retrofitted Rear Blinds,
Auto-Dimming Rear View Mirror,
Chrome Boot Struts
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2008 S8 D3 5.2 V10 - Engine: BSM, Gearbox:KLW, Colour:LY7F Suzuka Grey Pearl Effect, Interior:Black/Black with Silver/Black valcona leather with carbon atlas inserts, Bang & Olufsen, Heated windscreen, Soft-close doors, TV, DAB, AMI, Quad Zone, Auto Boot, Auto dim Mirrors, Keyless entry, PDC with rearview camera, AFS II Headlights
My DIY jobs -
Fan Jet Windscreen Washers,
Retrofitted Electric Side Blinds