To be honest, my experience with A8parts isn't that good. I purchased some heads for my V6 which apparently came from a VERY LOW MILEAGE 2.8 ACK Audi A6.
Party my fault for not overhauling the heads before fitting as I went along with what I was told only to find after 2k miles, The cam seal is goosed and valve stem guides too!! It would appear they came from a very high mileage car (or a low mileaged abused car) as I had replaced everything else new, oil, filter, pumps etc.
The guy also told me they bought perfectly running cars and dismantled to sell. If it's perfectly running etc, surely they're not going to make much money after has worker has removed parts and they sold them. There is the office/warehouse that he lets, wages and other overheads. There was two complete cars parked out the front when I collected the heads but certainly didn't look like they had been looked after in the slightest by the owners!!
That is my experience though.......