Cut open my Mann oil filter for my Sportwagen today after changing the oil at about dead-on 5K miles/3 mos. Last UOA showed increased aluminum numbers, it was a mid-OCI UOA after a trip down to GA for a VW event where it was used hard on the roads with "dragon" in the name. Quite shocked to see so much aluminum (not magnetic). TBH - first time opening my filter so not sure of the baseline/normal here. I beat on my car and this change included substantial hooning as well as ~40 1/4 and 1/8 mile drag runs at the track this OCI. Turbo bearing? Rings? I'll be interested to see this UOA!