Here are the last 3 oil analysis I had done on my 2006 VW GTI 2.0T.
Oil history:
0-5K miles: Factory fill
5K-10K miles: Mobil 1 0W-40
10K-15438 miles: Mobil 1 0W-40 (1st analysis)
15438-20120 miles: German Castrol 0W-30 (2nd analysis)
20120-25058 miles: German Castrol 0W-30 (3rd analysis)