There was never a V6 in the early cars, just low boost and high boost 1.8ts. These are great engines as long as they have been maintained. At this age and only 80k Id imagine hes done the bare minimum in upkeep, as in doing what failed and nothing preventatively. At this age miles Id question the timing belt/water pump, if any or all of the PCV has been replaced, if the haldex and diff fluids were done, and when the last major service was. Youre probably right in the sweet spot for suspension replacement time, shocks, upper arms etc. Have the car inspected by a qualified shop for any ideas, and ask the owner about timing belt or suspension work. If they both have not been done, it would be about 1000-1200 for the timing belt, plus nows the time for a major service while its all apart, and springs shocks and upper control arms could easily be 1500. They are great cars, we see some over 200k, my 1.8t has 155k on it an burns no oil, but its not always a cheap ride to hitting the 200k mark. Cars that sit and have lower miles usually need more work, esoecailly from deterioration of rubber and gaskets. Have a PPI done, and use whatever they find to negotiate