I'm selling my RS6 and it's been sitting in the garage for over a year (maybe close to 2yrs). I start it form time to time just to warm it up and get things moving. It was brought to a shop for inspection and they said that the turbos are toast. They said that the turbos are leaking from their seals because when they pry off the turbo outlet boots that leads to the intercoolers, oil poured out (maybe about 4 oz).
I was told by another mechanic that owned a few RS6 that this is normal for these cars if it sits for a while. Even if it has a small leak from the turbo seals you would probably never know since it would blow through the system, but if it sits, then it'll just collect at the low point.
The car runs well. The shop that inspected it did say it ran strong and well too. Car pulls strong. No hiccups. No rough idle. Before I took it off the road, I drove it for about 4 years and never had a low oil issue. Never had to add oil in between oil changes. Car has 51K on it. It sat in the same garage spot for over a year with no oil drips on the floor either. Yes, I have a splash guard on, but oil will probably drip through the splash guard.
So I'm not sold on the fact that the turbos are toast. The car just drives way too solid! What do you guys think? How would I check if they turbos are indeed good or bad? Use Vagcom to read boost while driving?