Be very careful when choosing who does your belt. The A8's belts (V6 or V8) need the tension setting whilst the cams and crank are locked in position but the pulleys can turn freely. This ensures the belt tension is correct whilst still maintaining perfect cam timing. If the belt is fitted without doing this, when the belt tension settles on it's first revolution, the cam timing goes out! And with inlet cams that can vary thier timing by upto 30degrees in operation that's BAD!!!!
Best case is the car loses power and just feels a bit weak and fuel consumption increases, but worst case is clipped valves!
If there are tip-ex marks that line up the outside diameter on your timing belt pulleys with the black metal cover behind them that's a sure sign it's fitted wrong wrong!
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