In the middle of a rod bearing replacement on a supercharged-prep M3 and noticed something odd on #3 rod bearing (upper):
Info
Vehicle: 2008 BMW M3, DCT
Production Date: 07/08
Oil Used: TWS Motorsport 10W-60, no data provided on previous oil change
Mileage: ~30,XXX mi
Fuel: 91 Oct
Driving Habits: Mostly highway/street driving, no track use
This is plastic wrapping that was left on the bearing during engine assembly, which was enough to provide pressure on the bearing and causing excessive wear on the upper bearing cap as evidenced below.
More info shortly as we look into this further.