Looking for some advice here.

I am currently looking at buying a 2009 A4 2.0T Quattro Convertible (yes it's on a B7 platform )with 87,500 miles from a private seller. I did my research and read up on the oil consumption issues that have plagued these engines so I called the dealership where the original owner bought and serviced the car to see what if anything had been done. They told me that the original owner had complained about oil consumption and the 1st 'test' step was carried out however it passed and they only thing they found was an issue with the valve cover which they replaced so the 2nd step was never carried out.

While looking at the car I have the sneaking suspicion that it's burning oil (oil was on Min and he had 2 quarts in the trunk), he also told me that he has had to keep it topped up. What recourse if any would I have with Audi if I purchased the car?