Need purchase tips!

Hello together.

after the search and the main page have not really brought me forward I try with this request here :

I want to get an old A8 up to max. 5 T€ and mileage approx. 200 TKM.
By. ==References== from 1998 onwards. ==References====External links== Automatic, absolutely.

Are there any boundary conditions to consider ?
Quattro yes/no ?
Problems with one of the engines ?
Is the 3.7l enough?
Problems off best. Running performance ?
What mileage is to be expected?
Gear problems?
Preferential to certain years of construction ?
Was wären wichtige kaufentscheidende Kriterien ?
Would the diesel be an alternative?
Small repairs that you can do yourself are no problem for me.

Or do you get nothing useful for the price ?

For every tip grateful,
Joe