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A rattle at the back of the engine during cold start will indicate that the cam chains have lost tension - this could be an expensive fix.
The biggest risk is the gearbox. Unfortunately the first version of the 0B5 s-tronic gearbox is known to have reliability issues. If the gearchanges are not smooth, especially coming down the gears then it could have a problem with the mechatronics. The clutchpacks do wear out and at 91K that car is in the window of possibility.
You'll learn more by searching the Audizine S4 forum.
 

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Good point. I often forget about the S5 coupe V8.
 
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