I just had my oil analyzed from my 2007 335i highly tuned car. I am using the Motul 300v 5w40 and everything seems really good, except for Chromium and Molybdenum. Before this, every value was fine with a different oil.
People are running much higher power than I do. My power level is pretty conservative on this platform.
I once let my friend drive my car, and he lugged the engine in 4th at around 1400rpm like twice. Is it possible it put so much side force on the pistons that it cause some piston ring wear?