If they did the "oil consumption test part 1", they should have given you instructions to come back again within a set mileage- at least 1000 miles- without adding any oil in the meantime. The second part of the test is that they drain the oil again, and weigh it, to see how much your vehicle has consumed in the amount of miles you have gone. Audi has a very specific rate of consumption that is "acceptable" and just averaging it out to "1 qt in 3000 miles" is not good enough, they want scientific readings.
Check back with your dealer- when they did the first part of the test they should have done an oil change to set the level correctly.
A warning light will come on if the system registers a low oil pressure- usually at that point you are pretty low on oil, and the pump is pumping aerated oil rather than thick oil from a full pan.
Are you not still under warranty on this? IF you addressed it and they attempted a fix already, at least it is documented.
Let me have your VIN and I will look up build data, see if there are any common issues on your engine.
OK- so the valve they did is usually one of the major culprits of oil consumption. If you still have something going on, make sure they do the entire consumption test again- they can't do step two now if you have added oil, and if they didn't tell you that is not your problem it is theirs. They will have to do step one again, set the level, and have you come back after 1000 miles or more without adding any oil.