I have a 1999 Cobra with 118000 miles. In a recent oil change I found some silver metal chips in the oil. They appear to be aluminum (they are non magnetic). I cut open the oil filter and found quite a few chips caught in the filter media. I pulled the valve covers off and didn't find any chips or grit around the valve train or the timing chains so it looks like a bottom end problem. The engine still runs fine with no obvious noises or vibrations. Has anyone experienced something similar or have an idea of the likely source of the chips?