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Update #2
After a lot of wrenching I pulled the sub frame, steering rack, oil pan etc. off and I did find some grey sludge in the bottom and a few gold flakes in the oil pan as well. I found the same amount of flakes in my N54 oil pan when I rebuilt it due to a bent rod and the rod bearings were actually in good shape. But because I am here already I am going to go ahead and replace all the rob bearings too. It takes so long to get the oil pan off that if you do it, you may as well change those bearings while your down there. Plus there is a decent chance one of mine bad anyway after finding what appears to be aluminum grey powder in the bottom of my oil pan. I did find the spring had worn into the cam phaser body which is made of aluminum so that could be the source of the grey but like I said. for $100 in bearings and about $30 in bolts it makes no sense to not do it.
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