Quote:
Originally Posted by Adrian E
Same component failed on our A6 Avant 3.0 petrol - sounded horrific but noise went away off idle. On stripping it the valve was full of crud, so be prepared to spend some time removing pipes in the vicinity and checking they're not blocked and/or squidgy from oil.
Not sure if it's the same for the '8 as was the case for the A6 but there were 2 part numbers, one being for a kit which included more bits and wasn't much different on price but included a couple of pipes - worth querying when you order 
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I will check when I order
Thanks for the advice