Just replaced the oil cooler in my D2, so feel for you doing it on the 5.2 V10.
In terms of the coolant pipes, if you're checking the parts online, make sure you're looking at diagrams that reference PR code 8Z5 (not hot country) or 8Z6 (hot country). There is a 8Z9 (super hot country) that has some additional parts. Attachment 741 shows the feed side of the system. EDIT: (Hover over the attachment to see the filename, and it's the last three digits prior to the file extension).
The return side also has slight variations. Attachment 424 has an additional oil cooler for the transfer box (#44) in the diagram, whereas attachment 452 doesn't have this oil cooler. Unfortunately, these don't have any PR code reference.
In terms of availability, you'd need to search online for all the rubber hoses that you require. I did a quick search on a couple of them and they are available, but the prices vary considerably between sellers. The online parts stores (not eBay) are a pain as they continue to list the parts, even though they've been discontinued and don't have any. I'm not aware of any aftermarket kits for the S8.
You might want to consider contacting forum member 'Spanker' (Dean), as living in Germany, he seems to have better access to more places to purchase from. Considering that you want to replace all the rubber hoses, you would need to do your homework first, by providing Dean with all the part numbers you're looking for.
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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
Sold! 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
Last edited by steamship; 9th June 2025 at 09:32 AM.
Reason: Clarifying the attachment numbers
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