Baumer2000S4

So I picked up a used B7 about 18 months ago with around 85K on it, though talking to Audi I learned that it got a new long block at 65K or so for high oil consumption, so I was looking at a car with only 20K on the motor. Fast forward to about 4 months ago (100K or so) and all of a sudden it has started burning about a quart per 800-1000 miles. I've been running Mobil 1 0W-40 in it since I got it.

While I figured it was a major shot in the dark, I contacted AoA to see if they would do anything about the new engine burning so much oil with only about 40K on it. They had me take it to the local dealer for diagnosis and they found that 3 of 4 cylinders on bank 2 have low compression, though only by a little below the wear limit. They said the wear limit is 9 bar and they are all around 8.5-8.7 bar. The cylinders on the other bank were all somewhere in the 9's as well. They scoped it too and said there wasn't any visible scoring or scratches on the cylinder walls. As I pretty much expected AoA said they wouldn't do anything and then told me it would be $25K for a new long block. I can't imagine why I'd spend that kind of money on a new engine for the car when the first two haven't gotten to 70K without giving up. I'd rather invest that $$$ in a whole new car.

In the meantime, does anyone have any recommendations on oil to use to possibly stem the issue for now? Will going to a 5W-40 help at all? Do the expensive Lubro-Moly and others help consumption? I'd hate to fill with that and have to keep replacing quarts as expensive as it goes for.