Most consider anything over 90K or five years (whichever comes first) to be a significant risk.
You should search the history on the T44 Audiworld forum. Lost of help on this.
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't let the V8 in the link worry you that it the correct part of the forum. Lost of helpful people.
For DIY you will need to borrow or rent a special tool that holds the crank shaft to loosed and re tighten the main bolt to 240 ft/lbs. If you buy the parts from an on line source you can usually rent the tools.
Really quite a doable DIY project if you have the good part of a day to work on it. Be very sure you understand how to check the valve timing before you start. If you have any questions you might be better contacting a local independent Audi mechanic to do it for you. Just be sure to check around to ensure that the mechanic has a good reputation with Audis. I would guess that it would cost $500 to $700.
Be sure to replace the water pump, idler pulley and front seal at the same time.
T> I have just found out that this recently acquired car has not had it's
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