Rod Bearings were ready to give up the ghost.
Well a few months back I was looking into replacing my rod bearings as I would be doing a few HPDE events this year. The WPC rod bearing group buy popped up, and I couldn't resist getting in on that.
A little history of the car. I picked up the car in Sept 2013. Before purchasing ran the vin with BMWNA, and they gave me the number to the dealership that serviced the car. When I called them they had informed me that the rod bearings were replaced at 20K miles. The car currently has 163k miles on it.
This Tuesday I dropped the car off at Max Psi to have the rod bearings replaced with the WPC treated stock bearings, and arp bolts. Now keep in mind the previous owner said he changed the oil every 5K miles.
http://www.60-130.com/images/importe..._zpsh40p-1.jpg
:facepalm
Wow am I glad I went ahead, and replaced them.