I have 52,500 on my 2015 3 with the 2.0. Definitely could use some more power. I've never done a UOA. The car has only had M1 0w20 EP/AFE. My commute the lat 1.5 years has been roughly 6k per year (12 miles a day to work, roundtrip.). Fuel dilution was a concern over the winter months as the oil leve went over the full mark which was the first time I noticed that. Since summer this hasn't occurred.