This UOA is for a 2013 Audi A6 3.0T Supercharged running Motul 8100 Xcess 5W40. 11,757mi mile run. Vehicle is driven daily with a 25/75 mix of city/hwy driving. First UOA was with Rotella T6 5W40 (old CJ-4). Second and most recent was with 8100 Xcess 5W40. Immediately after the recent UOA it was discovered that the customer had a failed PCV causing excessive oil consumption and fuel trimming. The PCV was replaced along with performing an intake port carbon cleaning with a walnut blaster.