I had high aluminum readings on my 40k mile '06 Jetta 2.5. I believe it was reading 10 after a 10k run on Castrol Syntec 5W-40.
I am 5500 miles into my first run of Mobil 1 0W-40, plan on goin 10k so should have a report on that oil in the next 3-4 months or so.